1
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Chaudron A, Li Z, Finco A, Marton P, Dufour P, Abdelsamie A, Fischer J, Collin S, Dkhil B, Hlinka J, Jacques V, Chauleau JY, Viret M, Bouzehouane K, Fusil S, Garcia V. Electric-field-induced multiferroic topological solitons. Nat Mater 2024:10.1038/s41563-024-01890-4. [PMID: 38710799 DOI: 10.1038/s41563-024-01890-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/20/2023] [Accepted: 04/04/2024] [Indexed: 05/08/2024]
Abstract
Topologically protected spin whirls in ferromagnets are foreseen as the cart-horse of solitonic information technologies. Nevertheless, the future of skyrmionics may rely on antiferromagnets due to their immunity to dipolar fields, straight motion along the driving force and ultrafast dynamics. While complex topological objects were recently discovered in intrinsic antiferromagnets, mastering their nucleation, stabilization and manipulation with energy-efficient means remains an outstanding challenge. Designing topological polar states in magnetoelectric antiferromagnetic multiferroics would allow one to electrically write, detect and erase topological antiferromagnetic entities. Here we stabilize ferroelectric centre states using a radial electric field in multiferroic BiFeO3 thin films. We show that such polar textures contain flux closures of antiferromagnetic spin cycloids, with distinct antiferromagnetic entities at their cores depending on the electric field polarity. By tuning the epitaxial strain, quadrants of canted antiferromagnetic domains can also be electrically designed. These results open the path to reconfigurable topological states in multiferroic antiferromagnets.
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Affiliation(s)
- Arthur Chaudron
- Laboratoire Albert Fert, CNRS, Thales, Université Paris-Saclay, Palaiseau, France
| | - Zixin Li
- Service de Physique de l'Etat Condensé (SPEC), French National Atomic Energy Commission (CEA), CNRS, Université Paris-Saclay, Gif-sur-Yvette, France
| | - Aurore Finco
- Laboratoire Charles Coulomb, Université de Montpellier, CNRS, Montpellier, France
| | - Pavel Marton
- Institute of Physics, Czech Academy of Sciences, Prague, Czech Republic
- Institute of Mechatronics and Computer Engineering, Technical University of Liberec, Liberec, Czech Republic
| | - Pauline Dufour
- Laboratoire Albert Fert, CNRS, Thales, Université Paris-Saclay, Palaiseau, France
| | - Amr Abdelsamie
- Laboratoire Albert Fert, CNRS, Thales, Université Paris-Saclay, Palaiseau, France
- Laboratoire Charles Coulomb, Université de Montpellier, CNRS, Montpellier, France
| | - Johanna Fischer
- Laboratoire Albert Fert, CNRS, Thales, Université Paris-Saclay, Palaiseau, France
| | - Sophie Collin
- Laboratoire Albert Fert, CNRS, Thales, Université Paris-Saclay, Palaiseau, France
| | - Brahim Dkhil
- Laboratoire Structures, Propriétés et Modélisation des Solides (SPMS), Université Paris-Saclay, CentraleSupélec, CNRS, Gif-sur-Yvette, France
| | - Jirka Hlinka
- Institute of Physics, Czech Academy of Sciences, Prague, Czech Republic
| | - Vincent Jacques
- Laboratoire Charles Coulomb, Université de Montpellier, CNRS, Montpellier, France
| | - Jean-Yves Chauleau
- Service de Physique de l'Etat Condensé (SPEC), French National Atomic Energy Commission (CEA), CNRS, Université Paris-Saclay, Gif-sur-Yvette, France
| | - Michel Viret
- Service de Physique de l'Etat Condensé (SPEC), French National Atomic Energy Commission (CEA), CNRS, Université Paris-Saclay, Gif-sur-Yvette, France
| | - Karim Bouzehouane
- Laboratoire Albert Fert, CNRS, Thales, Université Paris-Saclay, Palaiseau, France
| | - Stéphane Fusil
- Laboratoire Albert Fert, CNRS, Thales, Université Paris-Saclay, Palaiseau, France.
- Université d'Evry, Université Paris-Saclay, Evry, France.
| | - Vincent Garcia
- Laboratoire Albert Fert, CNRS, Thales, Université Paris-Saclay, Palaiseau, France.
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2
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Pham VT, Sisodia N, Di Manici I, Urrestarazu-Larrañaga J, Bairagi K, Pelloux-Prayer J, Guedas R, Buda-Prejbeanu LD, Auffret S, Locatelli A, Menteş TO, Pizzini S, Kumar P, Finco A, Jacques V, Gaudin G, Boulle O. Fast current-induced skyrmion motion in synthetic antiferromagnets. Science 2024; 384:307-312. [PMID: 38635712 DOI: 10.1126/science.add5751] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2022] [Accepted: 03/14/2024] [Indexed: 04/20/2024]
Abstract
Magnetic skyrmions are topological magnetic textures that hold great promise as nanoscale bits of information in memory and logic devices. Although room-temperature ferromagnetic skyrmions and their current-induced manipulation have been demonstrated, their velocity has been limited to about 100 meters per second. In addition, their dynamics are perturbed by the skyrmion Hall effect, a motion transverse to the current direction caused by the skyrmion topological charge. Here, we show that skyrmions in compensated synthetic antiferromagnets can be moved by current along the current direction at velocities of up to 900 meters per second. This can be explained by the cancellation of the net topological charge leading to a vanishing skyrmion Hall effect. Our results open an important path toward the realization of logic and memory devices based on the fast manipulation of skyrmions in tracks.
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Affiliation(s)
- Van Tuong Pham
- Université Grenoble Alpes, CNRS, CEA, SPINTEC, 38054 Grenoble, France
- Université Grenoble Alpes, CNRS, Institut Néel, 38042 Grenoble, France
| | - Naveen Sisodia
- Université Grenoble Alpes, CNRS, CEA, SPINTEC, 38054 Grenoble, France
- Department of Physics, Indian Institute of Technology Gandhinagar, Gandhinagar 382355, Gujarat, India
| | - Ilaria Di Manici
- Université Grenoble Alpes, CNRS, CEA, SPINTEC, 38054 Grenoble, France
| | | | - Kaushik Bairagi
- Université Grenoble Alpes, CNRS, CEA, SPINTEC, 38054 Grenoble, France
| | | | - Rodrigo Guedas
- Université Grenoble Alpes, CNRS, CEA, SPINTEC, 38054 Grenoble, France
- Instituto de Sistemas Optoelectrónicos y Microtecnología (ISOM), Universidad Politécnica de Madrid, 28040 Madrid, Spain
| | | | - Stéphane Auffret
- Université Grenoble Alpes, CNRS, CEA, SPINTEC, 38054 Grenoble, France
| | - Andrea Locatelli
- Elettra-Sincrotrone Trieste S.C.p.A., 34149 Basovizza, Trieste, Italy
| | | | - Stefania Pizzini
- Université Grenoble Alpes, CNRS, Institut Néel, 38042 Grenoble, France
| | - Pawan Kumar
- Laboratoire Charles Coulomb, Université de Montpellier, CNRS, 34095 Montpellier, France
| | - Aurore Finco
- Laboratoire Charles Coulomb, Université de Montpellier, CNRS, 34095 Montpellier, France
| | - Vincent Jacques
- Laboratoire Charles Coulomb, Université de Montpellier, CNRS, 34095 Montpellier, France
| | - Gilles Gaudin
- Université Grenoble Alpes, CNRS, CEA, SPINTEC, 38054 Grenoble, France
| | - Olivier Boulle
- Université Grenoble Alpes, CNRS, CEA, SPINTEC, 38054 Grenoble, France
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Janzen E, Schutte H, Plo J, Rousseau A, Michel T, Desrat W, Valvin P, Jacques V, Cassabois G, Gil B, Edgar JH. Boron and Nitrogen Isotope Effects on Hexagonal Boron Nitride Properties. Adv Mater 2024; 36:e2306033. [PMID: 37705372 DOI: 10.1002/adma.202306033] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/21/2023] [Revised: 08/22/2023] [Indexed: 09/15/2023]
Abstract
The unique physical, mechanical, chemical, optical, and electronic properties of hexagonal boron nitride (hBN) make it a promising 2D material for electronic, optoelectronic, nanophotonic, and quantum devices. Here, the changes in hBN's properties induced by isotopic purification in both boron and nitrogen are reported. Previous studies on isotopically pure hBN have focused on purifying the boron isotope concentration in hBN from its natural concentration (≈20 at% 10 B, 80 at% 11 B) while using naturally abundant nitrogen (99.6 at% 14 N, 0.4 at% 15 N), that is, almost pure 14 N. In this study, the class of isotopically purified hBN crystals to 15 N is extended. Crystals in the four configurations, namely h10 B14 N, h11 B14 N, h10 B15 N, and h11 B15 N, are grown by the metal flux method using boron and nitrogen single isotope (> 99%) enriched sources, with nickel plus chromium as the solvent. In-depth Raman and photoluminescence spectroscopies demonstrate the high quality of the monoisotopic hBN crystals with vibrational and optical properties of the 15 N-purified crystals at the state-of-the-art of currently available 14 N-purified hBN. The growth of high-quality h10 B14 N, h11 B14 N, h10 B15 N, and h11 B15 N opens exciting perspectives for thermal conductivity control in heat management, as well as for advanced functionalities in quantum technologies.
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Affiliation(s)
- Eli Janzen
- Tim Taylor Department of Chemical Engineering, Kansas State University, 1005 Durland Hall, 1701A Platt St., Manhattan, KS, 66506-5102, USA
| | - Hannah Schutte
- Tim Taylor Department of Chemical Engineering, Kansas State University, 1005 Durland Hall, 1701A Platt St., Manhattan, KS, 66506-5102, USA
| | - Juliette Plo
- Laboratoire Charles Coulomb, Université de Montpellier and CNRS, Montpellier, 34095, France
| | - Adrien Rousseau
- Laboratoire Charles Coulomb, Université de Montpellier and CNRS, Montpellier, 34095, France
| | - Thierry Michel
- Laboratoire Charles Coulomb, Université de Montpellier and CNRS, Montpellier, 34095, France
| | - Wilfried Desrat
- Laboratoire Charles Coulomb, Université de Montpellier and CNRS, Montpellier, 34095, France
| | - Pierre Valvin
- Laboratoire Charles Coulomb, Université de Montpellier and CNRS, Montpellier, 34095, France
| | - Vincent Jacques
- Laboratoire Charles Coulomb, Université de Montpellier and CNRS, Montpellier, 34095, France
| | - Guillaume Cassabois
- Laboratoire Charles Coulomb, Université de Montpellier and CNRS, Montpellier, 34095, France
| | - Bernard Gil
- Laboratoire Charles Coulomb, Université de Montpellier and CNRS, Montpellier, 34095, France
| | - James H Edgar
- Tim Taylor Department of Chemical Engineering, Kansas State University, 1005 Durland Hall, 1701A Platt St., Manhattan, KS, 66506-5102, USA
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4
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Dufour P, Abdelsamie A, Fischer J, Finco A, Haykal A, Sarott MF, Varotto S, Carrétéro C, Collin S, Godel F, Jaouen N, Viret M, Trassin M, Bouzehouane K, Jacques V, Chauleau JY, Fusil S, Garcia V. Onset of Multiferroicity in Prototypical Single-Spin Cycloid BiFeO 3 Thin Films. Nano Lett 2023; 23:9073-9079. [PMID: 37737821 DOI: 10.1021/acs.nanolett.3c02875] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/23/2023]
Abstract
In the room-temperature magnetoelectric multiferroic BiFeO3, the noncollinear antiferromagnetic state is coupled to the ferroelectric order, opening applications for low-power electric-field-controlled magnetic devices. While several strategies have been explored to simplify the ferroelectric landscape, here we directly stabilize a single-domain ferroelectric and spin cycloid state in epitaxial BiFeO3 (111) thin films grown on orthorhombic DyScO3 (011). Comparing them with films grown on SrTiO3 (111), we identify anisotropic in-plane strain as a powerful handle for tailoring the single antiferromagnetic state. In this single-domain multiferroic state, we establish the thickness limit of the coexisting electric and magnetic orders and directly visualize the suppression of the spin cycloid induced by the magnetoelectric interaction below the ultrathin limit of 1.4 nm. This as-grown single-domain multiferroic configuration in BiFeO3 thin films opens an avenue both for fundamental investigations and for electrically controlled noncollinear antiferromagnetic spintronics.
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Affiliation(s)
- Pauline Dufour
- Unité Mixte de Physique, CNRS, Thales, Université Paris-Saclay, 91767 Palaiseau, France
| | - Amr Abdelsamie
- Unité Mixte de Physique, CNRS, Thales, Université Paris-Saclay, 91767 Palaiseau, France
- Laboratoire Charles Coulomb, Université de Montpellier and CNRS, 34095 Montpellier, France
| | - Johanna Fischer
- Unité Mixte de Physique, CNRS, Thales, Université Paris-Saclay, 91767 Palaiseau, France
| | - Aurore Finco
- Laboratoire Charles Coulomb, Université de Montpellier and CNRS, 34095 Montpellier, France
| | - Angela Haykal
- Laboratoire Charles Coulomb, Université de Montpellier and CNRS, 34095 Montpellier, France
| | - Martin F Sarott
- Department of Materials, ETH Zurich, 8093 Zurich, Switzerland
| | - Sara Varotto
- Unité Mixte de Physique, CNRS, Thales, Université Paris-Saclay, 91767 Palaiseau, France
| | - Cécile Carrétéro
- Unité Mixte de Physique, CNRS, Thales, Université Paris-Saclay, 91767 Palaiseau, France
| | - Sophie Collin
- Unité Mixte de Physique, CNRS, Thales, Université Paris-Saclay, 91767 Palaiseau, France
| | - Florian Godel
- Unité Mixte de Physique, CNRS, Thales, Université Paris-Saclay, 91767 Palaiseau, France
| | | | - Michel Viret
- SPEC, CEA, CNRS, Université Paris-Saclay, 91191 Gif-sur-Yvette, France
| | - Morgan Trassin
- Department of Materials, ETH Zurich, 8093 Zurich, Switzerland
| | - Karim Bouzehouane
- Unité Mixte de Physique, CNRS, Thales, Université Paris-Saclay, 91767 Palaiseau, France
| | - Vincent Jacques
- Laboratoire Charles Coulomb, Université de Montpellier and CNRS, 34095 Montpellier, France
| | | | - Stéphane Fusil
- Unité Mixte de Physique, CNRS, Thales, Université Paris-Saclay, 91767 Palaiseau, France
- Université d'Evry, Université Paris-Saclay, 91000 Evry, France
| | - Vincent Garcia
- Unité Mixte de Physique, CNRS, Thales, Université Paris-Saclay, 91767 Palaiseau, France
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5
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Clua-Provost T, Durand A, Mu Z, Rastoin T, Fraunié J, Janzen E, Schutte H, Edgar JH, Seine G, Claverie A, Marie X, Robert C, Gil B, Cassabois G, Jacques V. Isotopic Control of the Boron-Vacancy Spin Defect in Hexagonal Boron Nitride. Phys Rev Lett 2023; 131:126901. [PMID: 37802939 DOI: 10.1103/physrevlett.131.126901] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2023] [Accepted: 08/26/2023] [Indexed: 10/08/2023]
Abstract
We report on electron spin resonance (ESR) spectroscopy of boron-vacancy (V_{B}^{-}) centers hosted in isotopically engineered hexagonal boron nitride (hBN) crystals. We first show that isotopic purification of hBN with ^{15}N yields a simplified and well-resolved hyperfine structure of V_{B}^{-} centers, while purification with ^{10}B leads to narrower ESR linewidths. These results establish isotopically purified h^{10}B^{15}N crystals as the optimal host material for future use of V_{B}^{-} spin defects in quantum technologies. Capitalizing on these findings, we then demonstrate optically induced polarization of ^{15}N nuclei in h^{10}B^{15}N, whose mechanism relies on electron-nuclear spin mixing in the V_{B}^{-} ground state. This work opens up new prospects for future developments of spin-based quantum sensors and simulators on a two-dimensional material platform.
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Affiliation(s)
- T Clua-Provost
- Laboratoire Charles Coulomb, Université de Montpellier and CNRS, 34095 Montpellier, France
| | - A Durand
- Laboratoire Charles Coulomb, Université de Montpellier and CNRS, 34095 Montpellier, France
| | - Z Mu
- Laboratoire Charles Coulomb, Université de Montpellier and CNRS, 34095 Montpellier, France
| | - T Rastoin
- Laboratoire Charles Coulomb, Université de Montpellier and CNRS, 34095 Montpellier, France
| | - J Fraunié
- Université de Toulouse, INSA-CNRS-UPS, LPCNO, 135 Avenue Rangueil, 31077 Toulouse, France
| | - E Janzen
- Tim Taylor Department of Chemical Engineering, Kansas State University, Manhattan, Kansas 66506, USA
| | - H Schutte
- Tim Taylor Department of Chemical Engineering, Kansas State University, Manhattan, Kansas 66506, USA
| | - J H Edgar
- Tim Taylor Department of Chemical Engineering, Kansas State University, Manhattan, Kansas 66506, USA
| | - G Seine
- CEMES-CNRS and Université de Toulouse, 29 rue J. Marvig, 31055 Toulouse, France
| | - A Claverie
- CEMES-CNRS and Université de Toulouse, 29 rue J. Marvig, 31055 Toulouse, France
| | - X Marie
- Université de Toulouse, INSA-CNRS-UPS, LPCNO, 135 Avenue Rangueil, 31077 Toulouse, France
| | - C Robert
- Université de Toulouse, INSA-CNRS-UPS, LPCNO, 135 Avenue Rangueil, 31077 Toulouse, France
| | - B Gil
- Laboratoire Charles Coulomb, Université de Montpellier and CNRS, 34095 Montpellier, France
| | - G Cassabois
- Laboratoire Charles Coulomb, Université de Montpellier and CNRS, 34095 Montpellier, France
| | - V Jacques
- Laboratoire Charles Coulomb, Université de Montpellier and CNRS, 34095 Montpellier, France
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6
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Durand A, Clua-Provost T, Fabre F, Kumar P, Li J, Edgar JH, Udvarhelyi P, Gali A, Marie X, Robert C, Gérard JM, Gil B, Cassabois G, Jacques V. Optically Active Spin Defects in Few-Layer Thick Hexagonal Boron Nitride. Phys Rev Lett 2023; 131:116902. [PMID: 37774304 DOI: 10.1103/physrevlett.131.116902] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/08/2023] [Accepted: 08/22/2023] [Indexed: 10/01/2023]
Abstract
Optically active spin defects in hexagonal boron nitride (hBN) are promising quantum systems for the design of two-dimensional quantum sensing units offering optimal proximity to the sample being probed. In this Letter, we first demonstrate that the electron spin resonance frequencies of boron vacancy centers (V_{B}^{-}) can be detected optically in the limit of few-atomic-layer thick hBN flakes despite the nanoscale proximity of the crystal surface that often leads to a degradation of the stability of solid-state spin defects. We then analyze the variations of the electronic spin properties of V_{B}^{-} centers with the hBN thickness with a focus on (i) the zero-field splitting parameters, (ii) the optically induced spin polarization rate and (iii) the longitudinal spin relaxation time. This Letter provides important insights into the properties of V_{B}^{-} centers embedded in ultrathin hBN flakes, which are valuable for future developments of foil-based quantum sensing technologies.
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Affiliation(s)
- A Durand
- Laboratoire Charles Coulomb, Université de Montpellier and CNRS, 34095 Montpellier, France
| | - T Clua-Provost
- Laboratoire Charles Coulomb, Université de Montpellier and CNRS, 34095 Montpellier, France
| | - F Fabre
- Laboratoire Charles Coulomb, Université de Montpellier and CNRS, 34095 Montpellier, France
| | - P Kumar
- Laboratoire Charles Coulomb, Université de Montpellier and CNRS, 34095 Montpellier, France
| | - J Li
- Tim Taylor Department of Chemical Engineering, Kansas State University, Kansas 66506, USA
| | - J H Edgar
- Tim Taylor Department of Chemical Engineering, Kansas State University, Kansas 66506, USA
| | - P Udvarhelyi
- Department of Atomic Physics, Budapest University of Technology and Economics, H-1111 Budapest, Hungary
| | - A Gali
- Department of Atomic Physics, Budapest University of Technology and Economics, H-1111 Budapest, Hungary
- Wigner Research Centre for Physics, P.O. Box 49, H-1525 Budapest, Hungary
| | - X Marie
- Université de Toulouse, INSA-CNRS-UPS, LPCNO, 135 Avenue Rangueil, 31077 Toulouse, France
| | - C Robert
- Université de Toulouse, INSA-CNRS-UPS, LPCNO, 135 Avenue Rangueil, 31077 Toulouse, France
| | - J M Gérard
- Univ. Grenoble Alpes, CEA, Grenoble INP, IRIG, PHELIQS, "Nanophysique et Semiconducteurs" Group, F-38000 Grenoble, France
| | - B Gil
- Laboratoire Charles Coulomb, Université de Montpellier and CNRS, 34095 Montpellier, France
| | - G Cassabois
- Laboratoire Charles Coulomb, Université de Montpellier and CNRS, 34095 Montpellier, France
| | - V Jacques
- Laboratoire Charles Coulomb, Université de Montpellier and CNRS, 34095 Montpellier, France
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7
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Abiven Y, Muñoz L, Da Silva Castro J, Correc G, Elkaim E, Fertey P, Legrand F, Medjoubi K, Noureddine A, Ribaud F, Somogyi A, Jacques V. SOLEIL ongoing development using industrial robots for beamline automation. Acta Cryst Sect A 2022. [DOI: 10.1107/s2053273322090167] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/19/2023]
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8
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Jarnac A, Jacques V, Cario L, Janod E, Johnson S, Ravy S, Laulhé C. Photoinduced charge-density wave phase in 1T-TaS 2: growth and coarsening mechanisms. Acta Cryst Sect A 2022. [DOI: 10.1107/s205327332209204x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/19/2023]
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9
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Haykal A, Tanos R, Minotto N, Durand A, Fabre F, Li J, Edgar JH, Ivády V, Gali A, Michel T, Dréau A, Gil B, Cassabois G, Jacques V. Decoherence of V[Formula: see text] spin defects in monoisotopic hexagonal boron nitride. Nat Commun 2022; 13:4347. [PMID: 35896526 PMCID: PMC9329290 DOI: 10.1038/s41467-022-31743-0] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2022] [Accepted: 06/21/2022] [Indexed: 11/20/2022] Open
Abstract
Spin defects in hexagonal boron nitride (hBN) are promising quantum systems for the design of flexible two-dimensional quantum sensing platforms. Here we rely on hBN crystals isotopically enriched with either 10B or 11B to investigate the isotope-dependent properties of a spin defect featuring a broadband photoluminescence signal in the near infrared. By analyzing the hyperfine structure of the spin defect while changing the boron isotope, we first confirm that it corresponds to the negatively charged boron-vacancy center ([Formula: see text]). We then show that its spin coherence properties are slightly improved in 10B-enriched samples. This is supported by numerical simulations employing cluster correlation expansion methods, which reveal the importance of the hyperfine Fermi contact term for calculating the coherence time of point defects in hBN. Using cross-relaxation spectroscopy, we finally identify dark electron spin impurities as an additional source of decoherence. This work provides new insights into the properties of [Formula: see text] spin defects, which are valuable for the future development of hBN-based quantum sensing foils.
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Affiliation(s)
- A. Haykal
- Laboratoire Charles Coulomb, Université de Montpellier and CNRS, Montpellier, France
| | - R. Tanos
- Laboratoire Charles Coulomb, Université de Montpellier and CNRS, Montpellier, France
| | - N. Minotto
- Laboratoire Charles Coulomb, Université de Montpellier and CNRS, Montpellier, France
| | - A. Durand
- Laboratoire Charles Coulomb, Université de Montpellier and CNRS, Montpellier, France
| | - F. Fabre
- Laboratoire Charles Coulomb, Université de Montpellier and CNRS, Montpellier, France
| | - J. Li
- Tim Taylor Department of Chemical Engineering, Kansas State University, Manhattan, KS USA
| | - J. H. Edgar
- Tim Taylor Department of Chemical Engineering, Kansas State University, Manhattan, KS USA
| | - V. Ivády
- Max Planck Institute for the Physics of Complex Systems, Dresden, Germany
- Department of Physics, Linköping University, Linköping, Sweden
| | - A. Gali
- Wigner Research Centre for Physics, Budapest, Hungary
- Department of Atomic Physics, Budapest University of Technology and Economics, Budapest, Hungary
| | - T. Michel
- Laboratoire Charles Coulomb, Université de Montpellier and CNRS, Montpellier, France
| | - A. Dréau
- Laboratoire Charles Coulomb, Université de Montpellier and CNRS, Montpellier, France
| | - B. Gil
- Laboratoire Charles Coulomb, Université de Montpellier and CNRS, Montpellier, France
| | - G. Cassabois
- Laboratoire Charles Coulomb, Université de Montpellier and CNRS, Montpellier, France
| | - V. Jacques
- Laboratoire Charles Coulomb, Université de Montpellier and CNRS, Montpellier, France
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10
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Monternier P, Singh J, Parasar P, Theurey P, DeWitt S, Jacques V, Klett E, Kaur N, Nagaraja TN, Moller DE, Hallakou‐Bozec S. Therapeutic potential of deuterium-stabilized (R)-pioglitazone-PXL065-for X-linked adrenoleukodystrophy. J Inherit Metab Dis 2022; 45:832-847. [PMID: 35510808 PMCID: PMC9545763 DOI: 10.1002/jimd.12510] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/14/2022] [Revised: 05/02/2022] [Accepted: 05/03/2022] [Indexed: 11/18/2022]
Abstract
X-linked adrenoleukodystrophy (ALD) results from ABCD1 gene mutations which impair Very Long Chain Fatty Acids (VLCFA; C26:0 and C24:0) peroxisomal import and β-oxidation, leading to accumulation in plasma and tissues. Excess VLCFA drives impaired cellular functions (e.g. disrupted mitochondrial function), inflammation, and neurodegeneration. Major disease phenotypes include: adrenomyeloneuropathy (AMN), progressive spinal cord axonal degeneration, and cerebral ALD (C-ALD), inflammatory white matter demyelination and degeneration. No pharmacological treatment is available to-date for ALD. Pioglitazone, an anti-diabetic thiazolidinedione, exerts potential benefits in ALD models. Its mechanisms are genomic (PPARγ agonism) and nongenomic (mitochondrial pyruvate carrier-MPC, long-chain acyl-CoA synthetase 4-ACSL4, inhibition). However, its use is limited by PPARγ-driven side effects (e.g. weight gain, edema). PXL065 is a clinical-stage deuterium-stabilized (R)-enantiomer of pioglitazone which lacks PPARγ agonism but retains MPC activity. Here, we show that incubation of ALD patient-derived cells (both AMN and C-ALD) and glial cells from Abcd1-null mice with PXL065 resulted in: normalization of elevated VLCFA, improved mitochondrial function, and attenuated indices of inflammation. Compensatory peroxisomal transporter gene expression was also induced. Additionally, chronic treatment of Abcd1-null mice lowered VLCFA in plasma, brain and spinal cord and improved both neural histology (sciatic nerve) and neurobehavioral test performance. Several in vivo effects of PXL065 exceeded those achieved with pioglitazone. PXL065 was confirmed to lack PPARγ agonism but retained ACSL4 activity of pioglitazone. PXL065 has novel actions and mechanisms and exhibits a range of potential benefits in ALD models; further testing of this molecule in ALD patients is warranted.
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Affiliation(s)
| | - Jaspreet Singh
- Department of NeurologyHenry Ford Health SystemDetroitMichiganUSA
| | - Parveen Parasar
- Department of NeurologyHenry Ford Health SystemDetroitMichiganUSA
| | | | | | | | - Eric Klett
- Department of Medicine, Division of EndocrinologyUniversity of North Carolina School of MedicineChapel HillNorth CarolinaUSA
| | - Navtej Kaur
- Department of NeurologyHenry Ford Health SystemDetroitMichiganUSA
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11
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Finco A, Haykal A, Fusil S, Kumar P, Dufour P, Forget A, Colson D, Chauleau JY, Viret M, Jaouen N, Garcia V, Jacques V. Imaging Topological Defects in a Noncollinear Antiferromagnet. Phys Rev Lett 2022; 128:187201. [PMID: 35594103 DOI: 10.1103/physrevlett.128.187201] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/04/2022] [Accepted: 04/07/2022] [Indexed: 06/15/2023]
Abstract
We report on the formation of topological defects emerging from the cycloidal antiferromagnetic order at the surface of bulk BiFeO_{3} crystals. Combining reciprocal and real-space magnetic imaging techniques, we first observe, in a single ferroelectric domain, the coexistence of antiferromagnetic domains in which the antiferromagnetic cycloid propagates along different wave vectors. We then show that the direction of these wave vectors is not strictly locked to the preferred crystallographic axes as continuous rotations bridge different wave vectors. At the junctions between the magnetic domains, we observe topological line defects identical to those found in a broad variety of lamellar physical systems with rotational symmetries. Our work establishes the presence of these magnetic objects at room temperature in the multiferroic antiferromagnet BiFeO_{3}, offering new possibilities for their use in spintronics.
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Affiliation(s)
- Aurore Finco
- Laboratoire Charles Coulomb, CNRS, Université de Montpellier, 34095 Montpellier, France
| | - Angela Haykal
- Laboratoire Charles Coulomb, CNRS, Université de Montpellier, 34095 Montpellier, France
| | - Stéphane Fusil
- Unité Mixte de Physique, CNRS, Thales, Université Paris-Saclay, 91767 Palaiseau, France
| | - Pawan Kumar
- Laboratoire Charles Coulomb, CNRS, Université de Montpellier, 34095 Montpellier, France
| | - Pauline Dufour
- Unité Mixte de Physique, CNRS, Thales, Université Paris-Saclay, 91767 Palaiseau, France
| | - Anne Forget
- SPEC, CEA, CNRS, Université Paris-Saclay, 91191 Gif sur Yvette, France
| | - Dorothée Colson
- SPEC, CEA, CNRS, Université Paris-Saclay, 91191 Gif sur Yvette, France
| | | | - Michel Viret
- SPEC, CEA, CNRS, Université Paris-Saclay, 91191 Gif sur Yvette, France
| | | | - Vincent Garcia
- Unité Mixte de Physique, CNRS, Thales, Université Paris-Saclay, 91767 Palaiseau, France
| | - Vincent Jacques
- Laboratoire Charles Coulomb, CNRS, Université de Montpellier, 34095 Montpellier, France
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12
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Happacher J, Broadway DA, Bocquel J, Reiser P, Jimenéz A, Tschudin MA, Thiel L, Rohner D, Puigibert MLG, Shields B, Maze JR, Jacques V, Maletinsky P. Low-Temperature Photophysics of Single Nitrogen-Vacancy Centers in Diamond. Phys Rev Lett 2022; 128:177401. [PMID: 35570423 DOI: 10.1103/physrevlett.128.177401] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/12/2021] [Revised: 12/17/2021] [Accepted: 02/18/2022] [Indexed: 06/15/2023]
Abstract
We investigate the magnetic field dependent photophysics of individual nitrogen-vacancy (NV) color centers in diamond under cryogenic conditions. At distinct magnetic fields, we observe significant reductions in the NV photoluminescence rate, which indicate a marked decrease in the optical readout efficiency of the NV's ground state spin. We assign these dips to excited state level anticrossings, which occur at magnetic fields that strongly depend on the effective, local strain environment of the NV center. Our results offer new insights into the structure of the NVs' excited states and a new tool for their effective characterization. Using this tool, we observe strong indications for strain-dependent variations of the NV's orbital g factor, obtain new insights into NV charge state dynamics, and draw important conclusions regarding the applicability of NV centers for low-temperature quantum sensing.
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Affiliation(s)
- Jodok Happacher
- Department of Physics, University of Basel, Klingelbergstrasse 82, Basel CH-4056, Switzerland
| | - David A Broadway
- Department of Physics, University of Basel, Klingelbergstrasse 82, Basel CH-4056, Switzerland
| | - Juanita Bocquel
- Department of Physics, University of Basel, Klingelbergstrasse 82, Basel CH-4056, Switzerland
| | - Patrick Reiser
- Department of Physics, University of Basel, Klingelbergstrasse 82, Basel CH-4056, Switzerland
| | - Alejandro Jimenéz
- Facultad de Física, Pontificia Universidad Católica de Chile, Santiago 7820436, Chile
| | - Märta A Tschudin
- Department of Physics, University of Basel, Klingelbergstrasse 82, Basel CH-4056, Switzerland
| | - Lucas Thiel
- Department of Physics, University of Basel, Klingelbergstrasse 82, Basel CH-4056, Switzerland
| | - Dominik Rohner
- Department of Physics, University of Basel, Klingelbergstrasse 82, Basel CH-4056, Switzerland
| | | | - Brendan Shields
- Department of Physics, University of Basel, Klingelbergstrasse 82, Basel CH-4056, Switzerland
| | - Jeronimo R Maze
- Facultad de Física, Pontificia Universidad Católica de Chile, Santiago 7820436, Chile
| | - Vincent Jacques
- Laboratoire Charles Coulomb, Université de Montpellier and CNRS, 34095 Montpellier, France
| | - Patrick Maletinsky
- Department of Physics, University of Basel, Klingelbergstrasse 82, Basel CH-4056, Switzerland
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13
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Jacques V. Revealing pinning and solitonic transport of sliding charge-density waves by coherent and nano-XRD. Acta Crystallogr A Found Adv 2021. [DOI: 10.1107/s0108767321092898] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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14
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Jacques V, Bolze S, Hallakou-Bozec S, Czarnik AW, Divakaruni AS, Fouqueray P, Murphy AN, Van der Ploeg LHT, DeWitt S. Deuterium-Stabilized ( R)-Pioglitazone (PXL065) Is Responsible for Pioglitazone Efficacy in NASH yet Exhibits Little to No PPARγ Activity. Hepatol Commun 2021; 5:1412-1425. [PMID: 34430785 PMCID: PMC8369945 DOI: 10.1002/hep4.1723] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/11/2020] [Revised: 02/19/2021] [Accepted: 03/12/2021] [Indexed: 02/04/2023] Open
Abstract
The antidiabetic drug pioglitazone is, to date, the most efficacious oral drug recommended off-label for the treatment of nondiabetic or diabetic patients with biopsy-proven nonalcoholic steatohepatitis (NASH). However, weight gain and edema side effects have limited its use for NASH. Pioglitazone is a mixture of two stereoisomers ((R)-pioglitazone and (S)-pioglitazone) that interconvert in vitro and in vivo. We aimed to characterize their individual pharmacology to develop a safer and potentially more potent drug for NASH. We stabilized the stereoisomers of pioglitazone with deuterium at the chiral center. Preclinical studies with deuterium-stabilized (R)-pioglitazone (PXL065) and (S)-pioglitazone demonstrated that (R)-pioglitazone retains the efficacy of pioglitazone in NASH, including reduced hepatic triglycerides, free fatty acids, cholesterol, steatosis, inflammation, hepatocyte enlargement, and fibrosis. Although both stereoisomers inhibit the mitochondrial pyruvate carrier, PXL065 shows limited to no peroxisome proliferator-activated receptor gamma (PPARγ) activity, whereas (S)-pioglitazone appears responsible for the PPARγ activity and associated weight gain. Nonetheless, in preclinical models, both stereoisomers reduce plasma glucose and hepatic fibrosis to the same extent as pioglitazone, suggesting that these benefits may also be mediated by altered mitochondrial metabolism. In a phase 1a clinical study, we demonstrated safety and tolerability of single 7.5-mg, 22.5-mg, and 30-mg doses of PXL065 as well as preferential exposure to the (R)-stereoisomer in comparison to 45-mg pioglitazone. Conclusion: PXL065 at a dose lower than 22.5 mg is predicted to exhibit efficacy for NASH equal to, or greater than, 45-mg pioglitazone without the potentially detrimental weight gain and edema. The development of PXL065 for NASH represents a unique opportunity to leverage the therapeutic benefits of pioglitazone, while reducing or eliminating PPARγ-related side effects.
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Affiliation(s)
| | | | | | | | - Ajit S Divakaruni
- Department of PharmacologyUniversity of California, San DiegoLa JollaCAUSA.,Department of Molecular and Medical PharmacologyUniversity of California, Los AngelesLos AngelesCAUSA
| | | | - Anne N Murphy
- Department of PharmacologyUniversity of California, San DiegoLa JollaCAUSA.,Cytokinetics IncSouth San FranciscoCAUSA
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15
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Durand A, Baron Y, Redjem W, Herzig T, Benali A, Pezzagna S, Meijer J, Kuznetsov AY, Gérard JM, Robert-Philip I, Abbarchi M, Jacques V, Cassabois G, Dréau A. Broad Diversity of Near-Infrared Single-Photon Emitters in Silicon. Phys Rev Lett 2021; 126:083602. [PMID: 33709758 DOI: 10.1103/physrevlett.126.083602] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/31/2020] [Accepted: 01/21/2021] [Indexed: 05/28/2023]
Abstract
We report the detection of individual emitters in silicon belonging to seven different families of optically active point defects. These fluorescent centers are created by carbon implantation of a commercial silicon-on-insulator wafer usually employed for integrated photonics. Single photon emission is demonstrated over the 1.1-1.55 μm range, spanning the O and C telecom bands. We analyze their photoluminescence spectra, dipolar emissions, and optical relaxation dynamics at 10 K. For a specific family, we show a constant emission intensity at saturation from 10 K to temperatures well above the 77 K liquid nitrogen temperature. Given the advanced control over nanofabrication and integration in silicon, these individual artificial atoms are promising systems to investigate for Si-based quantum technologies.
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Affiliation(s)
- A Durand
- Laboratoire Charles Coulomb, Université de Montpellier and CNRS, 34095 Montpellier, France
| | - Y Baron
- Laboratoire Charles Coulomb, Université de Montpellier and CNRS, 34095 Montpellier, France
| | - W Redjem
- Laboratoire Charles Coulomb, Université de Montpellier and CNRS, 34095 Montpellier, France
| | - T Herzig
- Division of Applied Quantum Systems, Felix-Bloch Institute for Solid-State Physics, University Leipzig, Linnéestraße 5, 04103 Leipzig, Germany
| | - A Benali
- CNRS, Aix-Marseille Université, Centrale Marseille, IM2NP, UMR 7334, Campus de St. Jérôme, 13397 Marseille, France
| | - S Pezzagna
- Division of Applied Quantum Systems, Felix-Bloch Institute for Solid-State Physics, University Leipzig, Linnéestraße 5, 04103 Leipzig, Germany
| | - J Meijer
- Division of Applied Quantum Systems, Felix-Bloch Institute for Solid-State Physics, University Leipzig, Linnéestraße 5, 04103 Leipzig, Germany
| | - A Yu Kuznetsov
- Department of Physics, University of Oslo, NO-0316 Oslo, Norway
| | - J-M Gérard
- Department of Physics, IRIG-PHELIQS, Univ. Grenoble Alpes and CEA, F-38000 Grenoble, France
| | - I Robert-Philip
- Laboratoire Charles Coulomb, Université de Montpellier and CNRS, 34095 Montpellier, France
| | - M Abbarchi
- CNRS, Aix-Marseille Université, Centrale Marseille, IM2NP, UMR 7334, Campus de St. Jérôme, 13397 Marseille, France
| | - V Jacques
- Laboratoire Charles Coulomb, Université de Montpellier and CNRS, 34095 Montpellier, France
| | - G Cassabois
- Laboratoire Charles Coulomb, Université de Montpellier and CNRS, 34095 Montpellier, France
| | - A Dréau
- Laboratoire Charles Coulomb, Université de Montpellier and CNRS, 34095 Montpellier, France
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16
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Finco A, Haykal A, Tanos R, Fabre F, Chouaieb S, Akhtar W, Robert-Philip I, Legrand W, Ajejas F, Bouzehouane K, Reyren N, Devolder T, Adam JP, Kim JV, Cros V, Jacques V. Imaging non-collinear antiferromagnetic textures via single spin relaxometry. Nat Commun 2021; 12:767. [PMID: 33536440 PMCID: PMC7859235 DOI: 10.1038/s41467-021-20995-x] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2020] [Accepted: 01/04/2021] [Indexed: 01/30/2023] Open
Abstract
Antiferromagnetic materials are promising platforms for next-generation spintronics owing to their fast dynamics and high robustness against parasitic magnetic fields. However, nanoscale imaging of the magnetic order in such materials with zero net magnetization remains a major experimental challenge. Here we show that non-collinear antiferromagnetic spin textures can be imaged by probing the magnetic noise they locally produce via thermal populations of magnons. To this end, we perform nanoscale, all-optical relaxometry with a scanning quantum sensor based on a single nitrogen-vacancy (NV) defect in diamond. Magnetic noise is detected through an increase of the spin relaxation rate of the NV defect, which results in an overall reduction of its photoluminescence signal under continuous laser illumination. As a proof-of-concept, the efficiency of the method is demonstrated by imaging various spin textures in synthetic antiferromagnets, including domain walls, spin spirals and antiferromagnetic skyrmions. This imaging procedure could be extended to a large class of intrinsic antiferromagnets and opens up new opportunities for studying the physics of localized spin wave modes for magnonics.
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Affiliation(s)
- Aurore Finco
- Laboratoire Charles Coulomb, Université de Montpellier and CNRS, 34095, Montpellier, France
| | - Angela Haykal
- Laboratoire Charles Coulomb, Université de Montpellier and CNRS, 34095, Montpellier, France
| | - Rana Tanos
- Laboratoire Charles Coulomb, Université de Montpellier and CNRS, 34095, Montpellier, France
| | - Florentin Fabre
- Laboratoire Charles Coulomb, Université de Montpellier and CNRS, 34095, Montpellier, France
| | - Saddem Chouaieb
- Laboratoire Charles Coulomb, Université de Montpellier and CNRS, 34095, Montpellier, France
| | - Waseem Akhtar
- Laboratoire Charles Coulomb, Université de Montpellier and CNRS, 34095, Montpellier, France
- Department of Physics, JMI, Central University, New Delhi, India
| | - Isabelle Robert-Philip
- Laboratoire Charles Coulomb, Université de Montpellier and CNRS, 34095, Montpellier, France
| | - William Legrand
- Unité Mixte de Physique, CNRS, Thales, Université Paris-Saclay, 91767, Palaiseau, France
| | - Fernando Ajejas
- Unité Mixte de Physique, CNRS, Thales, Université Paris-Saclay, 91767, Palaiseau, France
| | - Karim Bouzehouane
- Unité Mixte de Physique, CNRS, Thales, Université Paris-Saclay, 91767, Palaiseau, France
| | - Nicolas Reyren
- Unité Mixte de Physique, CNRS, Thales, Université Paris-Saclay, 91767, Palaiseau, France
| | - Thibaut Devolder
- Centre de Nanosciences et de Nanotechnologies, CNRS, Université Paris-Saclay, 91120, Palaiseau, France
| | - Jean-Paul Adam
- Centre de Nanosciences et de Nanotechnologies, CNRS, Université Paris-Saclay, 91120, Palaiseau, France
| | - Joo-Von Kim
- Centre de Nanosciences et de Nanotechnologies, CNRS, Université Paris-Saclay, 91120, Palaiseau, France
| | - Vincent Cros
- Unité Mixte de Physique, CNRS, Thales, Université Paris-Saclay, 91767, Palaiseau, France
| | - Vincent Jacques
- Laboratoire Charles Coulomb, Université de Montpellier and CNRS, 34095, Montpellier, France.
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17
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Abstract
![]()
Separation of the preferred enantiomer
from racemic mixtures, i.e.
“chiral switching,” often improves efficacy and reduces
toxicity. However, this strategy is not applicable for all chiral
compounds—particularly for molecules with hydrogen-containing
chiral centers, which can be prone to rapid stereoisomerization. Deuterium
incorporation can stabilize such chiral centers while retaining the
pharmacologic characteristics of the parent racemic mixture, thereby
enabling their “chiral switching”, changing the drug
from a racemate to a single enantiomer. We describe “deuterium-enabled
chiral switching” (DECS) as a means of improving on the therapeutic
promise of chemically unstable racemic drugs and demonstrate its utility
with the isolation and characterization of stable preferred enantiomers
of thalidomide and thiazolidinedione (TZD) analogs.
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Affiliation(s)
- Sheila DeWitt
- DeuteRx, LLC, 300 Brickstone Square, Suite 201, Andover Massachusetts 01810, United States
| | - Anthony W. Czarnik
- DeuteRx, LLC, 300 Brickstone Square, Suite 201, Andover Massachusetts 01810, United States
| | - Vincent Jacques
- DeuteRx, LLC, 300 Brickstone Square, Suite 201, Andover Massachusetts 01810, United States
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18
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Chauleau JY, Chirac T, Fusil S, Garcia V, Akhtar W, Tranchida J, Thibaudeau P, Gross I, Blouzon C, Finco A, Bibes M, Dkhil B, Khalyavin DD, Manuel P, Jacques V, Jaouen N, Viret M. Author Correction: Electric and antiferromagnetic chiral textures at multiferroic domain walls. Nat Mater 2020; 19:576. [PMID: 31719690 DOI: 10.1038/s41563-019-0558-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
An amendment to this paper has been published and can be accessed via a link at the top of the paper.
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Affiliation(s)
- J-Y Chauleau
- SPEC, CEA, CNRS, Université Paris-Saclay, Gif-sur-Yvette, France
- Synchrotron SOLEIL, Gif-sur-Yvette, France
| | - T Chirac
- SPEC, CEA, CNRS, Université Paris-Saclay, Gif-sur-Yvette, France
| | - S Fusil
- Unité Mixte de Physique, CNRS, Thales, Univ. Paris-Sud, Université Paris-Saclay, Palaiseau, France
- Université d'Evry, Université Paris-Saclay, Evry, France
| | - V Garcia
- Unité Mixte de Physique, CNRS, Thales, Univ. Paris-Sud, Université Paris-Saclay, Palaiseau, France
| | - W Akhtar
- Laboratoire Charles Coulomb, Université de Montpellier and CNRS, Montpellier, France
| | - J Tranchida
- CEA - DAM le Ripault, Monts, France
- Multiscale Science Department, Sandia National Laboratories, Albuquerque, NM, USA
| | | | - I Gross
- Laboratoire Charles Coulomb, Université de Montpellier and CNRS, Montpellier, France
| | - C Blouzon
- SPEC, CEA, CNRS, Université Paris-Saclay, Gif-sur-Yvette, France
| | - A Finco
- Laboratoire Charles Coulomb, Université de Montpellier and CNRS, Montpellier, France
| | - M Bibes
- Unité Mixte de Physique, CNRS, Thales, Univ. Paris-Sud, Université Paris-Saclay, Palaiseau, France
| | - B Dkhil
- Laboratoire Structures, Propriétés et Modélisation des Solides, CentraleSupélec, Université Paris-Saclay, Gif-Sur-Yvette, France
| | - D D Khalyavin
- ISIS Facility, STFC, Rutherford Appleton Laboratory, Didcot, UK
| | - P Manuel
- ISIS Facility, STFC, Rutherford Appleton Laboratory, Didcot, UK
| | - V Jacques
- Laboratoire Charles Coulomb, Université de Montpellier and CNRS, Montpellier, France
| | - N Jaouen
- Synchrotron SOLEIL, Gif-sur-Yvette, France
| | - M Viret
- SPEC, CEA, CNRS, Université Paris-Saclay, Gif-sur-Yvette, France.
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19
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Haykal A, Fischer J, Akhtar W, Chauleau JY, Sando D, Finco A, Godel F, Birkhölzer YA, Carrétéro C, Jaouen N, Bibes M, Viret M, Fusil S, Jacques V, Garcia V. Antiferromagnetic textures in BiFeO 3 controlled by strain and electric field. Nat Commun 2020; 11:1704. [PMID: 32249777 PMCID: PMC7136242 DOI: 10.1038/s41467-020-15501-8] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2019] [Accepted: 03/08/2020] [Indexed: 11/09/2022] Open
Abstract
Antiferromagnetic thin films are currently generating considerable excitement for low dissipation magnonics and spintronics. However, while tuneable antiferromagnetic textures form the backbone of functional devices, they are virtually unknown at the submicron scale. Here we image a wide variety of antiferromagnetic spin textures in multiferroic BiFeO3 thin films that can be tuned by strain and manipulated by electric fields through room-temperature magnetoelectric coupling. Using piezoresponse force microscopy and scanning NV magnetometry in self-organized ferroelectric patterns of BiFeO3, we reveal how strain stabilizes different types of non-collinear antiferromagnetic states (bulk-like and exotic spin cycloids) as well as collinear antiferromagnetic textures. Beyond these local-scale observations, resonant elastic X-ray scattering confirms the existence of both types of spin cycloids. Finally, we show that electric-field control of the ferroelectric landscape induces transitions either between collinear and non-collinear states or between different cycloids, offering perspectives for the design of reconfigurable antiferromagnetic spin textures on demand. Tailoring antiferromagnetic domains is critical for the development of low-dissipative spintronic and magnonic devices. Here the authors demonstrate the control of antiferromagnetic spin textures in multiferroic bismuth ferrite thin films using strain and electric fields.
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Affiliation(s)
- A Haykal
- Laboratoire Charles Coulomb, Université de Montpellier and CNRS, 34095, Montpellier, France
| | - J Fischer
- Unité Mixte de Physique, CNRS, Thales, Université Paris-Saclay, 91767, Palaiseau, France
| | - W Akhtar
- Laboratoire Charles Coulomb, Université de Montpellier and CNRS, 34095, Montpellier, France.,Department of Physics, JMI, Central University, New Delhi, India
| | - J-Y Chauleau
- SPEC, CEA, CNRS, Université Paris-Saclay, 91191, Gif-sur-Yvette, France
| | - D Sando
- School of Materials Science and Engineering, University of New South Wales, Sydney, 2052, Australia
| | - A Finco
- Laboratoire Charles Coulomb, Université de Montpellier and CNRS, 34095, Montpellier, France
| | - F Godel
- Unité Mixte de Physique, CNRS, Thales, Université Paris-Saclay, 91767, Palaiseau, France
| | - Y A Birkhölzer
- Department of Inorganic Materials Science, Faculty of Science and Technology and MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500 AE, Enschede, The Netherlands
| | - C Carrétéro
- Unité Mixte de Physique, CNRS, Thales, Université Paris-Saclay, 91767, Palaiseau, France
| | - N Jaouen
- Synchrotron SOLEIL, 91192, Gif-sur-Yvette, France
| | - M Bibes
- Unité Mixte de Physique, CNRS, Thales, Université Paris-Saclay, 91767, Palaiseau, France
| | - M Viret
- SPEC, CEA, CNRS, Université Paris-Saclay, 91191, Gif-sur-Yvette, France
| | - S Fusil
- Unité Mixte de Physique, CNRS, Thales, Université Paris-Saclay, 91767, Palaiseau, France. .,Université d'Evry, Université Paris-Saclay, Evry, France.
| | - V Jacques
- Laboratoire Charles Coulomb, Université de Montpellier and CNRS, 34095, Montpellier, France
| | - V Garcia
- Unité Mixte de Physique, CNRS, Thales, Université Paris-Saclay, 91767, Palaiseau, France
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Chauleau JY, Chirac T, Fusil S, Garcia V, Akhtar W, Tranchida J, Thibaudeau P, Gross I, Blouzon C, Finco A, Bibes M, Dkhil B, Khalyavin DD, Manuel P, Jacques V, Jaouen N, Viret M. Electric and antiferromagnetic chiral textures at multiferroic domain walls. Nat Mater 2020; 19:386-390. [PMID: 31685944 DOI: 10.1038/s41563-019-0516-z] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/18/2019] [Accepted: 09/19/2019] [Indexed: 06/10/2023]
Abstract
Chirality, a foundational concept throughout science, may arise at ferromagnetic domain walls1 and in related objects such as skyrmions2. However, chiral textures should also exist in other types of ferroic materials, such as antiferromagnets, for which theory predicts that they should move faster for lower power3, and ferroelectrics, where they should be extremely small and possess unusual topologies4,5. Here, we report the concomitant observation of antiferromagnetic and electric chiral textures at domain walls in the room-temperature ferroelectric antiferromagnet BiFeO3. Combining reciprocal and real-space characterization techniques, we reveal the presence of periodic chiral antiferromagnetic objects along the domain walls as well as a priori energetically unfavourable chiral ferroelectric domain walls. We discuss the mechanisms underlying their formation and their relevance for electrically controlled topological oxide electronics and spintronics.
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Affiliation(s)
- J-Y Chauleau
- SPEC, CEA, CNRS, Université Paris-Saclay, Gif-sur-Yvette, France
- Synchrotron SOLEIL, Gif-sur-Yvette, France
| | - T Chirac
- SPEC, CEA, CNRS, Université Paris-Saclay, Gif-sur-Yvette, France
| | - S Fusil
- Unité Mixte de Physique, CNRS, Thales, Univ. Paris-Sud, Université Paris-Saclay, Palaiseau, France
- Université d'Evry, Université Paris-Saclay, Evry, France
| | - V Garcia
- Unité Mixte de Physique, CNRS, Thales, Univ. Paris-Sud, Université Paris-Saclay, Palaiseau, France
| | - W Akhtar
- Laboratoire Charles Coulomb, Université de Montpellier and CNRS, Montpellier, France
| | - J Tranchida
- CEA - DAM le Ripault, Monts, France
- Multiscale Science Department, Sandia National Laboratories, Albuquerque, NM, USA
| | | | - I Gross
- Laboratoire Charles Coulomb, Université de Montpellier and CNRS, Montpellier, France
| | - C Blouzon
- SPEC, CEA, CNRS, Université Paris-Saclay, Gif-sur-Yvette, France
| | - A Finco
- Laboratoire Charles Coulomb, Université de Montpellier and CNRS, Montpellier, France
| | - M Bibes
- Unité Mixte de Physique, CNRS, Thales, Univ. Paris-Sud, Université Paris-Saclay, Palaiseau, France
| | - B Dkhil
- Laboratoire Structures, Propriétés et Modélisation des Solides, CentraleSupélec, Université Paris-Saclay, Gif-Sur-Yvette, France
| | - D D Khalyavin
- ISIS Facility, STFC, Rutherford Appleton Laboratory, Didcot, UK
| | - P Manuel
- ISIS Facility, STFC, Rutherford Appleton Laboratory, Didcot, UK
| | - V Jacques
- Laboratoire Charles Coulomb, Université de Montpellier and CNRS, Montpellier, France
| | - N Jaouen
- Synchrotron SOLEIL, Gif-sur-Yvette, France
| | - M Viret
- SPEC, CEA, CNRS, Université Paris-Saclay, Gif-sur-Yvette, France.
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Bellec E, Le Bolloc'h D, Jacques V, Gonzalez-Vallejo I. Evidence of charge-density wave transverse pinning by X-ray microdiffraction. Acta Crystallogr A Found Adv 2019. [DOI: 10.1107/s2053273319088429] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Ravy S, Laulhé C, Huber T, Ferrer A, Jacques V, Le Bolloc'h D, Mariager SO, Ingold G, Beaud P, Johnson SL. Time-resolved X-ray diffraction on density-wave systems. Acta Crystallogr A Found Adv 2017. [DOI: 10.1107/s2053273317085242] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Ravy S, Laulhé C, Huber T, Lantz G, Cario L, Corraze B, Janod E, Ferrer A, Rittmann J, Mariager S, Johnson JA, Gruebel S, Luebcke A, Huber L, Kubli M, Savoini M, Esposito V, Jacques V, Ingold G, Beaud P, Johnson SL. X-ray study of femtosecond structural dynamics of the charge-density wave compound 1T-TaS2. Acta Crystallogr A Found Adv 2016. [DOI: 10.1107/s2053273316097874] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Jia H, Wang Y, Morris CD, Jacques V, Gottesfeld JM, Rusche JR, Thomas EA. The Effects of Pharmacological Inhibition of Histone Deacetylase 3 (HDAC3) in Huntington's Disease Mice. PLoS One 2016; 11:e0152498. [PMID: 27031333 PMCID: PMC4816519 DOI: 10.1371/journal.pone.0152498] [Citation(s) in RCA: 60] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2015] [Accepted: 03/15/2016] [Indexed: 12/23/2022] Open
Abstract
An important epigenetic modification in Huntington’s disease (HD) research is histone acetylation, which is regulated by histone acetyltransferase and histone deacetylase (HDAC) enzymes. HDAC inhibitors have proven effective in HD model systems, and recent work is now focused on functional dissection of the individual HDAC enzymes in these effects. Histone deacetylase 3 (HDAC3), a member of the class I subfamily of HDACs, has previously been implicated in neuronal toxicity and huntingtin-induced cell death. Hence, we tested the effects of RGFP966 ((E)-N-(2-amino-4-fluorophenyl)-3-(1-cinnamyl-1H-pyrazol-4-yl)acrylamide), a benzamide-type HDAC inhibitor that selectively targets HDAC3, in the N171-82Q transgenic mouse model of HD. We found that RGFP966 at doses of 10 and 25 mg/kg improves motor deficits on rotarod and in open field exploration, accompanied by neuroprotective effects on striatal volume. In light of previous studies implicating HDAC3 in immune function, we measured gene expression changes for 84 immune-related genes elicited by RGFP966 using quantitative PCR arrays. RGFP966 treatment did not cause widespread changes in cytokine/chemokine gene expression patterns, but did significantly alter the striatal expression of macrophage migration inhibitory factor (Mif), a hormone immune modulator associated with glial cell activation, in N171-82Q transgenic mice, but not WT mice. Accordingly, RGFP966-treated mice showed decreased glial fibrillary acidic protein (GFAP) immunoreactivity, a marker of astrocyte activation, in the striatum of N171-82Q transgenic mice compared to vehicle-treated mice. These findings suggest that the beneficial actions of HDAC3 inhibition could be related, in part, with lowered Mif levels and its associated downstream effects.
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Affiliation(s)
- Haiqun Jia
- Department of Cellular and Molecular Neuroscience, The Scripps Research Institute, La Jolla, California, United States of America
- California Institute for Biomedical Research, La Jolla, California, United States of America
| | - Ying Wang
- Department of Cellular and Molecular Neuroscience, The Scripps Research Institute, La Jolla, California, United States of America
- California Institute for Biomedical Research, La Jolla, California, United States of America
| | - Charles D. Morris
- Department of Cellular and Molecular Neuroscience, The Scripps Research Institute, La Jolla, California, United States of America
| | - Vincent Jacques
- Repligen Corporation, Waltham, Massachusetts, United States of America
| | - Joel M. Gottesfeld
- Department of Cell and Molecular Biology, The Scripps Research Institute, La Jolla, California, United States of America
| | - James R. Rusche
- Repligen Corporation, Waltham, Massachusetts, United States of America
| | - Elizabeth A. Thomas
- Department of Cellular and Molecular Neuroscience, The Scripps Research Institute, La Jolla, California, United States of America
- * E-mail:
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Jamonneau P, Hétet G, Dréau A, Roch JF, Jacques V. Coherent Population Trapping of a Single Nuclear Spin Under Ambient Conditions. Phys Rev Lett 2016; 116:043603. [PMID: 26871331 DOI: 10.1103/physrevlett.116.043603] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/28/2015] [Indexed: 06/05/2023]
Abstract
We demonstrate coherent population trapping of a single nuclear spin in a room-temperature solid. To this end, we exploit a three-level system with a Λ configuration in the microwave domain, which consists of nuclear spin states addressed through their hyperfine coupling to the electron spin of a single nitrogen-vacancy defect in diamond. Moreover, the Λ-scheme relaxation is externally controlled through incoherent optical pumping and separated in time from consecutive coherent microwave excitations. Such a scheme allows us (i) to monitor the sequential accumulation of population into the dark state and (ii) to reach a novel regime of coherent population trapping dynamics for which periodic arrays of dark resonances can be observed, owing to multiple constructive interferences. This Letter offers new prospects for quantum state preparation, information storage in hybrid quantum systems, and metrology.
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Affiliation(s)
- P Jamonneau
- Laboratoire Aimé Cotton, CNRS, Université Paris-Sud, ENS Cachan, Université Paris-Saclay91405 Orsay Cedex, France
| | - G Hétet
- Laboratoire Aimé Cotton, CNRS, Université Paris-Sud, ENS Cachan, Université Paris-Saclay91405 Orsay Cedex, France
- Laboratoire Pierre Aigrain, CNRS, Université Pierre et Marie Curie, Université Paris Diderot and Ecole Normale Supérieure, 75005 Paris, France
| | - A Dréau
- Laboratoire Aimé Cotton, CNRS, Université Paris-Sud, ENS Cachan, Université Paris-Saclay91405 Orsay Cedex, France
| | - J-F Roch
- Laboratoire Aimé Cotton, CNRS, Université Paris-Sud, ENS Cachan, Université Paris-Saclay91405 Orsay Cedex, France
| | - V Jacques
- Laboratoire Aimé Cotton, CNRS, Université Paris-Sud, ENS Cachan, Université Paris-Saclay91405 Orsay Cedex, France
- Laboratoire Charles Coulomb, Université de Montpellier and CNRS, 34095 Montpellier, France
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Tetienne JP, Hingant T, Martínez L, Rohart S, Thiaville A, Diez LH, Garcia K, Adam JP, Kim JV, Roch JF, Miron I, Gaudin G, Vila L, Ocker B, Ravelosona D, Jacques V. The nature of domain walls in ultrathin ferromagnets revealed by scanning nanomagnetometry. Nat Commun 2015; 6:6733. [DOI: 10.1038/ncomms7733] [Citation(s) in RCA: 154] [Impact Index Per Article: 17.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2014] [Accepted: 02/23/2015] [Indexed: 11/09/2022] Open
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Dréau A, Jamonneau P, Gazzano O, Kosen S, Roch JF, Maze JR, Jacques V. Probing the dynamics of a nuclear spin bath in diamond through time-resolved central spin magnetometry. Phys Rev Lett 2014; 113:137601. [PMID: 25302916 DOI: 10.1103/physrevlett.113.137601] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/19/2014] [Indexed: 06/04/2023]
Abstract
Using fast electron spin resonance spectroscopy of a single nitrogen-vacancy defect in diamond, we demonstrate real-time readout of the Overhauser field produced by its nuclear spin environment under ambient conditions. These measurements enable narrowing the Overhauser field distribution by postselection, corresponding to a conditional preparation of the nuclear spin bath. Correlations of the Overhauser field fluctuations are quantitatively inferred by analyzing the Allan deviation over consecutive measurements. This method allows us to extract the dynamics of weakly coupled nuclear spins of the reservoir.
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Affiliation(s)
- A Dréau
- Laboratoire Aimé Cotton, CNRS, Université Paris-Sud and Ecole Normale Supérieure de Cachan, 91405 Orsay, France
| | - P Jamonneau
- Laboratoire Aimé Cotton, CNRS, Université Paris-Sud and Ecole Normale Supérieure de Cachan, 91405 Orsay, France
| | - O Gazzano
- Universität des Saarlandes, Fachrichtung 7.2 (Experimentalphysik), Campus E2.6, 66123 Saarbrücken, Germany
| | - S Kosen
- Laboratoire Aimé Cotton, CNRS, Université Paris-Sud and Ecole Normale Supérieure de Cachan, 91405 Orsay, France
| | - J-F Roch
- Laboratoire Aimé Cotton, CNRS, Université Paris-Sud and Ecole Normale Supérieure de Cachan, 91405 Orsay, France
| | - J R Maze
- Facultad de Física, Pontificia Universidad Católica de Chile, Santiago 7820436, Chile
| | - V Jacques
- Laboratoire Aimé Cotton, CNRS, Université Paris-Sud and Ecole Normale Supérieure de Cachan, 91405 Orsay, France
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Tetienne JP, Hingant T, Kim JV, Diez LH, Adam JP, Garcia K, Roch JF, Rohart S, Thiaville A, Ravelosona D, Jacques V. Nanoscale imaging and control of domain-wall hopping with a nitrogen-vacancy center microscope. Science 2014; 344:1366-9. [DOI: 10.1126/science.1250113] [Citation(s) in RCA: 142] [Impact Index Per Article: 14.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
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Abstract
The isolated electronic spin system of the nitrogen-vacancy (NV) centre in diamond offers unique possibilities to be employed as a nanoscale sensor for detection and imaging of weak magnetic fields. Magnetic imaging with nanometric resolution and field detection capabilities in the nanotesla range are enabled by the atomic-size and exceptionally long spin-coherence times of this naturally occurring defect. The exciting perspectives that ensue from these characteristics have triggered vivid experimental activities in the emerging field of 'NV magnetometry'. It is the purpose of this article to review the recent progress in high-sensitivity nanoscale NV magnetometry, generate an overview of the most pertinent results of the last years and highlight perspectives for future developments. We will present the physical principles that allow for magnetic field detection with NV centres and discuss first applications of NV magnetometers that have been demonstrated in the context of nano magnetism, mesoscopic physics and the life sciences.
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Affiliation(s)
- L Rondin
- Laboratoire de Photonique Quantique et Moléculaire, Ecole Normale Supérieure de Cachan and CNRS UMR 8537, 94235 Cachan Cedex, France
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Rohr S, Dupont-Ferrier E, Pigeau B, Verlot P, Jacques V, Arcizet O. Synchronizing the dynamics of a single nitrogen vacancy spin qubit on a parametrically coupled radio-frequency field through microwave dressing. Phys Rev Lett 2014; 112:010502. [PMID: 24483876 DOI: 10.1103/physrevlett.112.010502] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/08/2013] [Indexed: 06/03/2023]
Abstract
A hybrid spin-oscillator system in parametric interaction is experimentally emulated using a single nitrogen vacancy (NV) spin qubit immersed in a radio frequency (rf) field and probed with a quasiresonant microwave (MW) field. We report on the MW-mediated locking of the NV spin dynamics onto the rf field, appearing when the MW-driven Rabi precession frequency approaches the rf frequency and for sufficiently large rf amplitudes. These signatures are analogous to a phononic Mollow triplet in the MW rotating frame for the parametric interaction and promise to have impact in spin-dependent force detection strategies.
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Affiliation(s)
- S Rohr
- Institut Néel, CNRS et Université Joseph Fourier, 38042 Grenoble, France
| | - E Dupont-Ferrier
- Institut Néel, CNRS et Université Joseph Fourier, 38042 Grenoble, France
| | - B Pigeau
- Institut Néel, CNRS et Université Joseph Fourier, 38042 Grenoble, France
| | - P Verlot
- Institut Néel, CNRS et Université Joseph Fourier, 38042 Grenoble, France
| | - V Jacques
- Laboratoire Aimé Cotton, CNRS, Université Paris-Sud and ENS Cachan, 91405 Orsay, France
| | - O Arcizet
- Institut Néel, CNRS et Université Joseph Fourier, 38042 Grenoble, France
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Arroyo-Camejo S, Adam MP, Besbes M, Hugonin JP, Jacques V, Greffet JJ, Roch JF, Hell SW, Treussart F. Stimulated emission depletion microscopy resolves individual nitrogen vacancy centers in diamond nanocrystals. ACS Nano 2013; 7:10912-9. [PMID: 24245613 DOI: 10.1021/nn404421b] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Nitrogen-vacancy (NV) color centers in nanodiamonds are highly promising for bioimaging and sensing. However, resolving individual NV centers within nanodiamond particles and the controlled addressing and readout of their spin state has remained a major challenge. Spatially stochastic super-resolution techniques cannot provide this capability in principle, whereas coordinate-controlled super-resolution imaging methods, like stimulated emission depletion (STED) microscopy, have been predicted to fail in nanodiamonds. Here we show that, contrary to these predictions, STED can resolve single NV centers in 40-250 nm sized nanodiamonds with a resolution of ≈10 nm. Even multiple adjacent NVs located in single nanodiamonds can be imaged individually down to relative distances of ≈15 nm. Far-field optical super-resolution of NVs inside nanodiamonds is highly relevant for bioimaging applications of these fluorescent nanolabels. The targeted addressing and readout of individual NV(-) spins inside nanodiamonds by STED should also be of high significance for quantum sensing and information applications.
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Affiliation(s)
- Silvia Arroyo-Camejo
- Department of NanoBiophotonics, Max Planck Institute for Biophysical Chemistry , 37077 Goettingen, Germany
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Mayer L, Slablab A, Dantelle G, Jacques V, Lepagnol-Bestel AM, Perruchas S, Spinicelli P, Thomas A, Chauvat D, Simonneau M, Gacoin T, Roch JF. Single KTP nanocrystals as second-harmonic generation biolabels in cortical neurons. Nanoscale 2013; 5:8466-71. [PMID: 23852161 DOI: 10.1039/c3nr01251d] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
We report an efficient colloidal synthesis of KTiOPO4 (KTP) nanocrystals with excellent crystallinity and the direct observation of optical second-harmonic generation (SHG) from discrete KTP nanocrystals in neurons cultured from mammalian brain cortex. Direct internalization and monitoring of these nanoparticles was successfully achieved without limitations from cytotoxicity, bleaching and blinking emission.
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Affiliation(s)
- Ludovic Mayer
- Laboratoire de Physique de la Matière Condensée-Ecole Polytechnique-CNRS, UMR 7643, 91128 Palaiseau Cedex, France
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Bhaskara S, Jacques V, Rusche JR, Olson EN, Cairns BR, Chandrasekharan MB. Histone deacetylases 1 and 2 maintain S-phase chromatin and DNA replication fork progression. Epigenetics Chromatin 2013; 6:27. [PMID: 23947532 PMCID: PMC3765969 DOI: 10.1186/1756-8935-6-27] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2013] [Accepted: 07/26/2013] [Indexed: 12/25/2022] Open
Abstract
BACKGROUND Histone deacetylases (HDACs) play a critical role in the maintenance of genome stability. Class I HDACs, histone deacetylase 1 and 2 (Hdac1 and Hdac2) are recruited to the replication fork by virtue of their interactions with the replication machinery. However, functions for Hdac1 and Hdac2 (Hdacs1,2) in DNA replication are not fully understood. RESULTS Using genetic knockdown systems and novel Hdacs1,2-selective inhibitors, we found that loss of Hdacs1,2 leads to a reduction in the replication fork velocity, and an increase in replication stress response culminating in DNA damage. These observed defects are due to a direct role for Hdacs1,2 in DNA replication, as transcription of genes involved in replication was not affected in the absence of Hdacs1,2. We found that loss of Hdacs1,2 functions increases histone acetylation (ac) on chromatin in S-phase cells and affects nascent chromatin structure, as evidenced by the altered sensitivity of newly synthesized DNA to nuclease digestion. Specifically, H4K16ac, a histone modification involved in chromatin decompaction, is increased on nascent chromatin upon abolishing Hdacs1,2 activities. It was previously shown that H4K16ac interferes with the functions of SMARCA5, an ATP-dependent ISWI family chromatin remodeler. We found SMARCA5 also associates with nascent DNA and loss of SMARCA5 decreases replication fork velocity similar to the loss or inhibition of Hdacs1,2. CONCLUSIONS Our studies reveal important roles for Hdacs1,2 in nascent chromatin structure maintenance and regulation of SMARCA5 chromatin-remodeler function, which together are required for proper replication fork progression and genome stability in S-phase.
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Affiliation(s)
- Srividya Bhaskara
- Department of Radiation Oncology, University of Utah School of Medicine, Salt Lake City 84112, UT, USA.
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Rondin L, Tetienne JP, Rohart S, Thiaville A, Hingant T, Spinicelli P, Roch JF, Jacques V. Stray-field imaging of magnetic vortices with a single diamond spin. Nat Commun 2013; 4:2279. [DOI: 10.1038/ncomms3279] [Citation(s) in RCA: 111] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2013] [Accepted: 07/09/2013] [Indexed: 11/09/2022] Open
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Gogliotti RG, Cardona H, Singh J, Bail S, Emery C, Kuntz N, Jorgensen M, Durens M, Xia B, Barlow C, Heier CR, Plasterer HL, Jacques V, Kiledjian M, Jarecki J, Rusche J, DiDonato CJ. The DcpS inhibitor RG3039 improves survival, function and motor unit pathologies in two SMA mouse models. Hum Mol Genet 2013; 22:4084-101. [PMID: 23736298 DOI: 10.1093/hmg/ddt258] [Citation(s) in RCA: 71] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Spinal muscular atrophy (SMA) is caused by insufficient levels of the survival motor neuron (SMN) protein due to the functional loss of the SMN1 gene and the inability of its paralog, SMN2, to fully compensate due to reduced exon 7 splicing efficiency. Since SMA patients have at least one copy of SMN2, drug discovery campaigns have sought to identify SMN2 inducers. C5-substituted quinazolines increase SMN2 promoter activity in cell-based assays and a derivative, RG3039, has progressed to clinical testing. It is orally bioavailable, brain-penetrant and has been shown to be an inhibitor of the mRNA decapping enzyme, DcpS. Our pharmacological characterization of RG3039, reported here, demonstrates that RG3039 can extend survival and improve function in two SMA mouse models of varying disease severity (Taiwanese 5058 Hemi and 2B/- SMA mice), and positively impacts neuromuscular pathologies. In 2B/- SMA mice, RG3039 provided a >600% survival benefit (median 18 days to >112 days) when dosing began at P4, highlighting the importance of early intervention. We determined the minimum effective dose and the associated pharmacokinetic (PK) and exposure relationship of RG3039 and DcpS inhibition ex vivo. These data support the long PK half-life with extended pharmacodynamic outcome of RG3039 in 2B/- SMA mice. In motor neurons, RG3039 significantly increased both the average number of cells with gems and average number of gems per cell, which is used as an indirect measure of SMN levels. These studies contribute to dose selection and exposure estimates for the first studies with RG3039 in human subjects.
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Van Meerbeke JP, Gibbs RM, Plasterer HL, Miao W, Feng Z, Lin MY, Rucki AA, Wee CD, Xia B, Sharma S, Jacques V, Li DK, Pellizzoni L, Rusche JR, Ko CP, Sumner CJ. The DcpS inhibitor RG3039 improves motor function in SMA mice. Hum Mol Genet 2013; 22:4074-83. [PMID: 23727836 DOI: 10.1093/hmg/ddt257] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Spinal muscular atrophy (SMA) is caused by mutations of the survival motor neuron 1 (SMN1) gene, retention of the survival motor neuron 2 (SMN2) gene and insufficient expression of full-length survival motor neuron (SMN) protein. Quinazolines increase SMN2 promoter activity and inhibit the ribonucleic acid scavenger enzyme DcpS. The quinazoline derivative RG3039 has advanced to early phase clinical trials. In preparation for efficacy studies in SMA patients, we investigated the effects of RG3039 in severe SMA mice. Here, we show that RG3039 distributed to central nervous system tissues where it robustly inhibited DcpS enzyme activity, but minimally activated SMN expression or the assembly of small nuclear ribonucleoproteins. Nonetheless, treated SMA mice showed a dose-dependent increase in survival, weight and motor function. This was associated with improved motor neuron somal and neuromuscular junction synaptic innervation and function and increased muscle size. RG3039 also enhanced survival of conditional SMA mice in which SMN had been genetically restored to motor neurons. As this systemically delivered drug may have therapeutic benefits that extend beyond motor neurons, it could act additively with SMN-restoring therapies delivered directly to the central nervous system such as antisense oligonucleotides or gene therapy.
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Jacques V, Vial F, Lerintiu M, Thilly N, Mc Nelis U, Raft J, Bouaziz H. Réhabilitation périopératoire des césariennes programmées non compliquées en France : enquête de pratique nationale. ACTA ACUST UNITED AC 2013; 32:142-8. [DOI: 10.1016/j.annfar.2013.01.016] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2012] [Accepted: 01/15/2013] [Indexed: 10/27/2022]
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Malvaez M, McQuown SC, Rogge GA, Astarabadi M, Jacques V, Carreiro S, Rusche JR, Wood MA. HDAC3-selective inhibitor enhances extinction of cocaine-seeking behavior in a persistent manner. Proc Natl Acad Sci U S A 2013; 110:2647-52. [PMID: 23297220 PMCID: PMC3574934 DOI: 10.1073/pnas.1213364110] [Citation(s) in RCA: 299] [Impact Index Per Article: 27.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
Abstract
Nonspecific histone deacetylase (HDAC) inhibition has been shown to facilitate the extinction of drug-seeking behavior in a manner resistant to reinstatement. A key open question is which specific HDAC is involved in the extinction of drug-seeking behavior. Using the selective HDAC3 inhibitor RGFP966, we investigated the role of HDAC3 in extinction and found that systemic treatment with RGFP966 facilitates extinction in mice in a manner resistant to reinstatement. We also investigated whether the facilitated extinction is related to the enhancement of extinction consolidation during extinction learning or to negative effects on performance or reconsolidation. These are key distinctions with regard to any compound being used to modulate extinction, because a more rapid decrease in a defined behavior is interpreted as facilitated extinction. Using an innovative combination of behavioral paradigms, we found that a single treatment of RGFP966 enhances extinction of a previously established cocaine-conditioned place preference, while simultaneously enhancing long-term object-location memory within subjects. During extinction consolidation, HDAC3 inhibition promotes a distinct pattern of histone acetylation linked to gene expression within the infralimbic cortex, hippocampus, and nucleus accumbens. Thus, the facilitated extinction of drug-seeking cannot be explained by adverse effects on performance. These results demonstrate that HDAC3 inhibition enhances the memory processes involved in extinction of drug-seeking behavior.
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Affiliation(s)
- Melissa Malvaez
- Department of Neurobiology and Behavior, Center for the Neurobiology of Learning and Memory, University of California, Irvine, CA 92697
| | - Susan C. McQuown
- Department of Neurobiology and Behavior, Center for the Neurobiology of Learning and Memory, University of California, Irvine, CA 92697
- Dart NeuroScience, San Diego, CA 92121; and
| | - George A. Rogge
- Department of Neurobiology and Behavior, Center for the Neurobiology of Learning and Memory, University of California, Irvine, CA 92697
| | - Mariam Astarabadi
- Department of Neurobiology and Behavior, Center for the Neurobiology of Learning and Memory, University of California, Irvine, CA 92697
| | | | | | | | - Marcelo A. Wood
- Department of Neurobiology and Behavior, Center for the Neurobiology of Learning and Memory, University of California, Irvine, CA 92697
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Dréau A, Spinicelli P, Maze JR, Roch JF, Jacques V. Single-shot readout of multiple nuclear spin qubits in diamond under ambient conditions. Phys Rev Lett 2013; 110:060502. [PMID: 23432227 DOI: 10.1103/physrevlett.110.060502] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/23/2012] [Indexed: 06/01/2023]
Abstract
We use the electronic spin of a single nitrogen-vacancy defect in diamond to observe the real-time evolution of neighboring single nuclear spins under ambient conditions. Using a diamond sample with a natural abundance of (13)C isotopes, we first demonstrate high fidelity initialization and single-shot readout of an individual (13)C nuclear spin. By including the intrinsic (14)N nuclear spin of the nitrogen-vacancy defect in the quantum register, we then report the simultaneous observation of quantum jumps linked to both nuclear spin species, providing an efficient initialization of the two qubits. These results open up new avenues for diamond-based quantum information processing including active feedback in quantum error correction protocols and tests of quantum correlations with solid-state single spins at room temperature.
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Affiliation(s)
- A Dréau
- Laboratoire de Photonique Quantique et Moléculaire, Ecole Normale Supérieure de Cachan and CNRS UMR 8537, 94235 Cachan, France
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Soragni E, Xu C, Plasterer HL, Jacques V, Rusche JR, Gottesfeld JM. Rationale for the development of 2-aminobenzamide histone deacetylase inhibitors as therapeutics for Friedreich ataxia. J Child Neurol 2012; 27:1164-73. [PMID: 22764181 PMCID: PMC3743553 DOI: 10.1177/0883073812448533] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Numerous studies have pointed to histone deacetylase inhibitors as potential therapeutics for various neurodegenerative diseases, and clinical trials with several histone deacetylase inhibitors have been performed or are under way. However, histone deacetylase inhibitors tested to date either are highly cytotoxic or have very low specificities for different histone deacetylase enzymes. The authors' laboratories have identified a novel class of histone deacetylase inhibitors (2-aminobenzamides) that reverses heterochromatin-mediated silencing of the frataxin (FXN) gene in Friedreich ataxia. The authors have identified the histone deacetylase enzyme isotype target of these compounds and present evidence that compounds that target this enzyme selectively increase FXN expression from pathogenic alleles. Studies with model compounds show that these histone deacetylase inhibitors increase FXN messenger RNA levels in the brain in mouse models for Friedreich ataxia and relieve neurological symptoms observed in mouse models and support the notion that this class of molecules may serve as therapeutics for the human disease.
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Affiliation(s)
- Elisabetta Soragni
- Department of Molecular Biology, The Scripps Research Institute, La Jolla, California
| | - Chunping Xu
- Department of Molecular Biology, The Scripps Research Institute, La Jolla, California
| | | | | | | | - Joel M. Gottesfeld
- Department of Molecular Biology, The Scripps Research Institute, La Jolla, California
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Jia H, Pallos J, Jacques V, Lau A, Tang B, Cooper A, Syed A, Purcell J, Chen Y, Sharma S, Sangrey GR, Darnell SB, Plasterer H, Sadri-Vakili G, Gottesfeld JM, Thompson LM, Rusche JR, Marsh JL, Thomas EA. Histone deacetylase (HDAC) inhibitors targeting HDAC3 and HDAC1 ameliorate polyglutamine-elicited phenotypes in model systems of Huntington's disease. Neurobiol Dis 2012; 46:351-61. [DOI: 10.1016/j.nbd.2012.01.016] [Citation(s) in RCA: 134] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
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Van Meerbeke J, Gibbs R, Plasterer H, Feng Z, Lin MY, Wee C, Xia B, Jacques V, Rusche J, Ko CP, Sumner C. The Therapeutic Effects of RG3039 in Severe Spinal Muscular Atrophy Mice and Normal Human Volunteers (SC01.002). Neurology 2012. [DOI: 10.1212/wnl.78.1_meetingabstracts.sc01.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Van Meerbeke J, Gibbs R, Plasterer H, Feng Z, Lin MY, Wee C, Xia B, Jacques V, Rusche J, Ko CP, Sumner C. The Therapeutic Effects of RG3039 in Severe Spinal Muscular Atrophy Mice and Normal Human Volunteers (S25.003). Neurology 2012. [DOI: 10.1212/wnl.78.1_meetingabstracts.s25.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Slablab A, Le Xuan L, Zielinski M, de Wilde Y, Jacques V, Chauvat D, Roch JF. Second-harmonic generation from coupled plasmon modes in a single dimer of gold nanospheres. Opt Express 2012; 20:220-227. [PMID: 22274345 DOI: 10.1364/oe.20.000220] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
We show that a dimer made of two gold nanospheres exhibits a remarkable efficiency for second-harmonic generation under femtosecond optical excitation. The detectable nonlinear emission for the given particle size and excitation wavelength arises when the two nanoparticles are as close as possible to contact, as in situ controlled and measured using the tip of an atomic force microscope. The excitation wavelength dependence of the second-harmonic signal supports a coupled plasmon resonance origin with radiation from the dimer gap. This nanometer-size light source might be used for high-resolution near-field optical microscopy.
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Affiliation(s)
- A Slablab
- Laboratoire de Photonique Quantique et Moléculaire, Ecole Normale Supérieure de Cachan and CNRS, UMR 8537, F-94235 Cachan Cedex, France
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Jacques V, Guerci P, Vial F, Abel F, Bouaziz H. Dissection de l’aorte descendante et prééclampsie à 30 semaines d’aménorrhée : prise en charge médicale et césarienne. ACTA ACUST UNITED AC 2012; 31:67-71. [DOI: 10.1016/j.annfar.2011.09.010] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2011] [Accepted: 09/16/2011] [Indexed: 11/25/2022]
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Kubo Y, Grezes C, Dewes A, Umeda T, Isoya J, Sumiya H, Morishita N, Abe H, Onoda S, Ohshima T, Jacques V, Dréau A, Roch JF, Diniz I, Auffeves A, Vion D, Esteve D, Bertet P. Hybrid quantum circuit with a superconducting qubit coupled to a spin ensemble. Phys Rev Lett 2011; 107:220501. [PMID: 22182018 DOI: 10.1103/physrevlett.107.220501] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/19/2011] [Indexed: 05/31/2023]
Abstract
We report the experimental realization of a hybrid quantum circuit combining a superconducting qubit and an ensemble of electronic spins. The qubit, of the transmon type, is coherently coupled to the spin ensemble consisting of nitrogen-vacancy centers in a diamond crystal via a frequency-tunable superconducting resonator acting as a quantum bus. Using this circuit, we prepare a superposition of the qubit states that we store into collective excitations of the spin ensemble and retrieve back into the qubit later on. These results constitute a proof of concept of spin-ensemble based quantum memory for superconducting qubits.
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Affiliation(s)
- Y Kubo
- Quantronics group, SPEC (CNRS URA 2464), IRAMIS, DSM, CEA-Saclay, 91191 Gif-sur-Yvette, France
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Ravy S, Jacques V, Le Bolloc'h D, Pinsolle E, Sauvage-Simkin M, Livet F. Bulk dislocation core dissociation probed by coherent X rays in silicon. Acta Crystallogr A 2011. [DOI: 10.1107/s0108767311088842] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Sriram R, Lagerstedt JO, Petrlova J, Samardzic H, Kreutzer U, Xie H, Kaysen GA, Desreux JF, Thonon D, Jacques V, Van Loan M, Rutledge JC, Oda MN, Voss JC, Jue T. Imaging apolipoprotein AI in vivo. NMR Biomed 2011; 24:916-24. [PMID: 21264979 PMCID: PMC3726305 DOI: 10.1002/nbm.1650] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/01/2009] [Revised: 10/20/2010] [Accepted: 10/31/2010] [Indexed: 05/30/2023]
Abstract
Coronary disease risk increases inversely with high-density lipoprotein (HDL) level. The measurement of the biodistribution and clearance of HDL in vivo, however, has posed a technical challenge. This study presents an approach to the development of a lipoprotein MRI agent by linking gadolinium methanethiosulfonate (Gd[MTS-ADO3A]) to a selective cysteine mutation in position 55 of apo AI, the major protein of HDL. The contrast agent targets both liver and kidney, the sites of HDL catabolism, whereas the standard MRI contrast agent, gadolinium-diethylenetriaminepentaacetic acid-bismethylamide (GdDTPA-BMA, gadodiamide), enhances only the kidney image. Using a modified apolipoprotein AI to create an HDL contrast agent provides a new approach to investigate HDL biodistribution, metabolism and regulation in vivo.
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Affiliation(s)
- Renuka Sriram
- Biochemistry and Molecular Medicine, University of California Davis, Davis, CA, USA
| | | | - Jitka Petrlova
- Biochemistry and Molecular Medicine, University of California Davis, Davis, CA, USA
| | - Haris Samardzic
- Biochemistry and Molecular Medicine, University of California Davis, Davis, CA, USA
| | - Ulrike Kreutzer
- Biochemistry and Molecular Medicine, University of California Davis, Davis, CA, USA
| | - Hongtao Xie
- Biochemistry and Molecular Medicine, University of California Davis, Davis, CA, USA
| | - George A. Kaysen
- Biochemistry and Molecular Medicine, University of California Davis, Davis, CA, USA
| | - Jean F. Desreux
- Coordination and Radiochemistry, University of Liege, Liege, Belgium
| | - David Thonon
- Coordination and Radiochemistry, University of Liege, Liege, Belgium
| | | | - Martha Van Loan
- Nutrition Department, University of California Davis, Davis, CA, USA
| | - John C. Rutledge
- Division of Endocrinology, Clinical Nutrition and Vascular Medicine, Department of Internal Medicine, University of California Davis, Davis, CA, USA
| | - Michael N. Oda
- Children’s Hospital Oakland Research Institute, Oakland, CA, USA
| | - John C. Voss
- Biochemistry and Molecular Medicine, University of California Davis, Davis, CA, USA
| | - Thomas Jue
- Biochemistry and Molecular Medicine, University of California Davis, Davis, CA, USA
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Jacques V, Dumas S, Sun WC, Troughton JS, Greenfield MT, Caravan P. High-relaxivity magnetic resonance imaging contrast agents. Part 2. Optimization of inner- and second-sphere relaxivity. Invest Radiol 2011; 45:613-24. [PMID: 20808234 DOI: 10.1097/rli.0b013e3181ee6a49] [Citation(s) in RCA: 96] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
RATIONALE AND OBJECTIVES The observed relaxivity of gadolinium-based contrast agents has contributions from the water molecule(s) that bind directly to the gadolinium ion (inner-sphere water), long-lived water molecules and exchangeable protons that make up the second-sphere of coordination, and water molecules that diffuse near the contrast agent (outer-sphere). Inner- and second-sphere relaxivity can both be increased by optimization of the lifetimes of the water molecules and protons in these coordination spheres, the rotational motion of the complex, and the electronic relaxation of the gadolinium ion. We sought to identify new high-relaxivity contrast agents by systematically varying the donor atoms that bind directly to gadolinium to increase inner-sphere relaxivity and concurrently including substituents that influence the second-sphere relaxivity. METHODS Twenty gadolinium-1,4,7,10-tetraazacyclo-dodecane-N,N',N″,N'″-tetraacetato derivatives were prepared and their relaxivity determined in presence and absence of human serum albumin as a function of temperature and magnetic field. Data was analyzed to extract the underlying molecular parameters influencing relaxivity. Each compound had a common albumin-binding group and an inner-sphere donor set comprising the 4 tertiary amine N atoms from cyclen, an α-substituted acetate oxygen atom, 2 amide oxygen atoms, an inner-sphere water oxygen atom, and a variable donor group. Each amide nitrogen was substituted with different groups to promote hydrogen bonding with second-sphere water molecules. RESULTS Relativities at 0.47 and 1.4 T, 37°C, in serum albumin ranged from 16.0 to 58.1 mM(-1)s(-1) and from 12.3 to 34.8 mM(-1)s(-1), respectively. The reduction of inner-sphere water exchange typical of amide donor groups could be offset by incorporating a phosphonate or phenolate oxygen atom donor in the first coordination sphere, resulting in higher relaxivity. Amide nitrogen substitution with pendant phosphonate or carboxylate groups increased relaxivity by as much as 88% compared with the N-methyl amide analog. Second-sphere relaxivity contributed as much as 24 and 14 mM(-1)s(-1) at 0.47 and 1.4 T, respectively. CONCLUSIONS Water/proton exchange dynamics in the inner- and second-coordination sphere can be predictably tuned by choice of donor atoms and second-sphere substituents, resulting in high-relaxivity agents.
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Siyushev P, Kaiser F, Jacques V, Gerhardt I, Bischof S, Fedder H, Dodson J, Markham M, Twitchen D, Jelezko F, Wrachtrup J. Monolithic diamond optics for single photon detection. Appl Phys Lett 2010; 97:241902. [PMID: 21221249 PMCID: PMC3017569 DOI: 10.1063/1.3519849] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/10/2010] [Accepted: 10/16/2010] [Indexed: 05/22/2023]
Abstract
In this work, we experimentally demonstrate a novel and simple approach that uses off-the-shelf optical elements to enhance the collection efficiency from a single emitter. The key component is a solid immersion lens made of diamond, the host material for single color centers. We improve the excitation and detection of single emitters by one order of magnitude, as predicted by theory.
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