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Zhong D, Gao S, Saccone M, Greer JR, Bernardi M, Nadj-Perge S, Faraon A. Carbon-Related Quantum Emitter in Hexagonal Boron Nitride with Homogeneous Energy and 3-Fold Polarization. Nano Lett 2024; 24:1106-1113. [PMID: 38240528 PMCID: PMC10835729 DOI: 10.1021/acs.nanolett.3c03628] [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: 02/01/2024]
Abstract
Most hexagonal boron nitride (hBN) single-photon emitters (SPEs) studied to date suffer from variable emission energy and unpredictable polarization, two crucial obstacles to their application in quantum technologies. Here, we report an SPE in hBN with an energy of 2.2444 ± 0.0013 eV created via carbon implantation that exhibits a small inhomogeneity of the emission energy. Polarization-resolved measurements reveal aligned absorption and emission dipole orientations with a 3-fold distribution, which follows the crystal symmetry. Photoluminescence excitation (PLE) spectroscopy results show the predictability of polarization is associated with a reproducible PLE band, in contrast with the non-reproducible bands found in previous hBN SPE species. Photon correlation measurements are consistent with a three-level model with weak coupling to a shelving state. Our ab initio excited-state calculations shed light on the atomic origin of this SPE defect, which consists of a pair of substitutional carbon atoms located at boron and nitrogen sites separated by a hexagonal unit cell.
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Affiliation(s)
- Ding Zhong
- Thomas J. Watson, Sr., Laboratory of Applied Physics, California Institute of Technology, Pasadena, California 91125, United States
- Kavli Nanoscience Institute, California Institute of Technology, Pasadena, California 91125, United States
- Institute for Quantum Information and Matter, California Institute of Technology, Pasadena, California 91125, United States
| | - Shiyuan Gao
- Department of Applied Physics and Material Science, California Institute of Technology, Pasadena, California 91125, United States
| | - Max Saccone
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, United States
| | - Julia R Greer
- Division of Engineering and Applied Science, California Institute of Technology, Pasadena, California 91125, United States
| | - Marco Bernardi
- Department of Applied Physics and Material Science, California Institute of Technology, Pasadena, California 91125, United States
| | - Stevan Nadj-Perge
- Thomas J. Watson, Sr., Laboratory of Applied Physics, California Institute of Technology, Pasadena, California 91125, United States
- Institute for Quantum Information and Matter, California Institute of Technology, Pasadena, California 91125, United States
| | - Andrei Faraon
- Thomas J. Watson, Sr., Laboratory of Applied Physics, California Institute of Technology, Pasadena, California 91125, United States
- Kavli Nanoscience Institute, California Institute of Technology, Pasadena, California 91125, United States
- Institute for Quantum Information and Matter, California Institute of Technology, Pasadena, California 91125, United States
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May A, Saccone M, van den Berg A, Askey J, Hunt M, Ladak S. Magnetic charge propagation upon a 3D artificial spin-ice. Nat Commun 2021; 12:3217. [PMID: 34050163 PMCID: PMC8163774 DOI: 10.1038/s41467-021-23480-7] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2020] [Accepted: 04/30/2021] [Indexed: 11/09/2022] Open
Abstract
Magnetic charge propagation in spin-ice materials has yielded a paradigm-shift in science, allowing the symmetry between electricity and magnetism to be studied. Recent work is now suggesting the spin-ice surface may be important in mediating the ordering and associated phase space in such materials. Here, we detail a 3D artificial spin-ice, which captures the exact geometry of bulk systems, allowing magnetic charge dynamics to be directly visualized upon the surface. Using magnetic force microscopy, we observe vastly different magnetic charge dynamics along two principal directions. For a field applied along the surface termination, local energetics force magnetic charges to nucleate over a larger characteristic distance, reducing their magnetic Coulomb interaction and producing uncorrelated monopoles. In contrast, applying a field transverse to the surface termination yields highly correlated monopole-antimonopole pairs. Detailed simulations suggest it is the difference in effective chemical potential as well as the energy landscape experienced during dynamics that yields the striking differences in monopole transport.
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Affiliation(s)
- A May
- School of Physics and Astronomy, Cardiff University, Cardiff, UK
| | - M Saccone
- Center for Nonlinear Studies, Los Alamos National Laboratory, Los Alamos, NM, USA.,Theoretical Division (T4), Los Alamos National Laboratory, Los Alamos, NM, USA
| | - A van den Berg
- School of Physics and Astronomy, Cardiff University, Cardiff, UK
| | - J Askey
- School of Physics and Astronomy, Cardiff University, Cardiff, UK
| | - M Hunt
- School of Physics and Astronomy, Cardiff University, Cardiff, UK
| | - S Ladak
- School of Physics and Astronomy, Cardiff University, Cardiff, UK.
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Vezzoli V, Duminuco P, Pogliaghi G, Saccone M, Cangiano B, Rosatelli MC, Meloni A, Persani L, Bonomi M. Two novel truncating variants of the AAAS gene causative of the triple A syndrome. J Endocrinol Invest 2020; 43:973-982. [PMID: 31939195 DOI: 10.1007/s40618-020-01180-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/30/2019] [Accepted: 01/06/2020] [Indexed: 01/15/2023]
Abstract
PURPOSE The triple A syndrome (AAAS) is an inherited condition associated with mutations in the AAAS gene, which encodes a protein of 546 amino acids known as ALADIN (alacrima achalasia adrenal insufficiency neurologic disorder) whose function is not well understood. This protein belongs to the WD-repeat family of regulatory proteins and is located in the nuclear pore complexes. Only a few cohorts of AAAS patients have been reported and fully characterized. Thus, the objective of the present study was to report on a mini cohort of Italian AAAS patients and to get insights on their predisposing genetic defects. METHODS Genetic analysis of AAAS gene in triple A syndrome patient and molecular and functional characterization of the novel identified allelic variants. RESULTS Here we describe three newly diagnosed cases of AAAS, in whom genetic analysis allowed us to identify two novel allelic variants in the AAAS gene: the frameshift substitution c.765 dupT (p.Gly256Trp fsX67) in exon 8 and the splice site mutation in intron 11(c.997-2 A > G, IVS11-2A > G). Both variants result in a truncated non-functional protein, as we demonstrate by transcript analysis and expression studies. CONCLUSIONS Our findings establish a pathogenic role for both new variants. Moreover, our data highlight the essential role of the C-terminal domain of the protein for its correct targeting and function and underline the importance of sequencing splice sites surrounding the intron-exon junctions to ensure accurate molecular diagnosis and correct genetic counseling in AAAS patients.
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Affiliation(s)
- V Vezzoli
- Dipartimento di Scienze Cliniche e di Comunità, Division of Endocrine and Metabolic Diseases and Lab. of Endocrine and Metabolic Research, Dipartimento di Medicina Endocrino-Metabolica, Università degli studi di Milano, IRCCS Istituto Auxologico Italiano, Piazzale Brescia 20, 20149, Milano, Italy
| | - P Duminuco
- Dipartimento di Scienze Cliniche e di Comunità, Division of Endocrine and Metabolic Diseases and Lab. of Endocrine and Metabolic Research, Dipartimento di Medicina Endocrino-Metabolica, Università degli studi di Milano, IRCCS Istituto Auxologico Italiano, Piazzale Brescia 20, 20149, Milano, Italy
| | - G Pogliaghi
- Dipartimento di Scienze Cliniche e di Comunità, Division of Endocrine and Metabolic Diseases and Lab. of Endocrine and Metabolic Research, Dipartimento di Medicina Endocrino-Metabolica, Università degli studi di Milano, IRCCS Istituto Auxologico Italiano, Piazzale Brescia 20, 20149, Milano, Italy
| | - M Saccone
- Dipartimento di Scienze Cliniche e di Comunità, Division of Endocrine and Metabolic Diseases and Lab. of Endocrine and Metabolic Research, Dipartimento di Medicina Endocrino-Metabolica, Università degli studi di Milano, IRCCS Istituto Auxologico Italiano, Piazzale Brescia 20, 20149, Milano, Italy
| | - B Cangiano
- Dipartimento di Scienze Cliniche e di Comunità, Division of Endocrine and Metabolic Diseases and Lab. of Endocrine and Metabolic Research, Dipartimento di Medicina Endocrino-Metabolica, Università degli studi di Milano, IRCCS Istituto Auxologico Italiano, Piazzale Brescia 20, 20149, Milano, Italy
- Department of Clinical Sciences and Community Health, University of Milan, Milan, Italy
| | - M C Rosatelli
- Pediatric Hospital "Microcitemico" Antonio Cao, Azienda Ospedaliera Brotzu, University of Cagliari, Cagliary, Italy
| | - A Meloni
- Pediatric Hospital "Microcitemico" Antonio Cao, Azienda Ospedaliera Brotzu, University of Cagliari, Cagliary, Italy
| | - L Persani
- Dipartimento di Scienze Cliniche e di Comunità, Division of Endocrine and Metabolic Diseases and Lab. of Endocrine and Metabolic Research, Dipartimento di Medicina Endocrino-Metabolica, Università degli studi di Milano, IRCCS Istituto Auxologico Italiano, Piazzale Brescia 20, 20149, Milano, Italy
- Department of Clinical Sciences and Community Health, University of Milan, Milan, Italy
| | - M Bonomi
- Dipartimento di Scienze Cliniche e di Comunità, Division of Endocrine and Metabolic Diseases and Lab. of Endocrine and Metabolic Research, Dipartimento di Medicina Endocrino-Metabolica, Università degli studi di Milano, IRCCS Istituto Auxologico Italiano, Piazzale Brescia 20, 20149, Milano, Italy.
- Department of Clinical Sciences and Community Health, University of Milan, Milan, Italy.
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Liu P, Liu AT, Kozawa D, Dong J, Yang JF, Koman VB, Saccone M, Wang S, Son Y, Wong MH, Strano MS. Autoperforation of 2D materials for generating two-terminal memristive Janus particles. Nat Mater 2018; 17:1005-1012. [PMID: 30353088 DOI: 10.1038/s41563-018-0197-z] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/04/2017] [Accepted: 09/17/2018] [Indexed: 06/08/2023]
Abstract
Graphene and other two-dimensional materials possess desirable mechanical, electrical and chemical properties for incorporation into or onto colloidal particles, potentially granting them unique electronic functions. However, this application has not yet been realized, because conventional top-down lithography scales poorly for producing colloidal solutions. Here, we develop an 'autoperforation' technique that provides a means of spontaneous assembly for surfaces composed of two-dimensional molecular scaffolds. Chemical vapour deposited two-dimensional sheets can autoperforate into circular envelopes when sandwiching a microprinted polymer composite disk of nanoparticle ink, allowing liftoff into solution and simultaneous assembly. The resulting colloidal microparticles have two independently addressable, external Janus faces that we show can function as an intraparticle array of vertically aligned, two-terminal electronic devices. Such particles demonstrate remarkable chemical and mechanical stability and form the basis of particulate electronic devices capable of collecting and storing information about their surroundings, extending nanoelectronics into previously inaccessible environments.
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Affiliation(s)
- Pingwei Liu
- State Key Lab of Chemical Engineering, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, China
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Albert Tianxiang Liu
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Daichi Kozawa
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Juyao Dong
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Jing Fan Yang
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Volodymyr B Koman
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Max Saccone
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Song Wang
- State Key Lab of Chemical Engineering, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, China
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Youngwoo Son
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Min Hao Wong
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA
| | - Michael S Strano
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA.
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Kuzyk PRT, Saccone M, Sprague S, Simunovic N, Bhandari M, Schemitsch EH. Cross-linked versus conventional polyethylene for total hip replacement. ACTA ACUST UNITED AC 2011; 93:593-600. [DOI: 10.1302/0301-620x.93b5.25908] [Citation(s) in RCA: 90] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
We conducted a systematic review and meta-analysis of randomised controlled trials comparing cross-linked with conventional polyethylene liners for total hip replacement in order to determine whether these liners reduce rates of wear, radiological evidence of osteolysis and the need for revision. The MEDLINE, EMBASE and COCHRANE databases were searched from their inception to May 2010 for all trials involving the use of cross-linked polyethylene in total hip replacement. Eligibility for inclusion in the review included the random allocation of treatments, the use of cross-linked and conventional polyethylene, and radiological wear as an outcome measure. The pooled mean differences were calculated for bedding-in, linear wear rate, three-dimensional linear wear rate, volumetric wear rate and total linear wear. Pooled risk ratios were calculated for radiological osteolysis and revision hip replacement. A search of the literature identified 194 potential studies, of which 12 met the inclusion criteria. All reported a significant reduction in radiological wear for cross-linked polyethylene. The pooled mean differences for linear rate of wear, three-dimensional linear rate of wear, volumetric wear rate and total linear wear were all significantly reduced for cross-linked polyethylene. The risk ratio for radiological osteolysis was 0.40 (95% confidence interval 0.27 to 0.58; I2 = 0%), favouring cross-linked polyethylene. The follow-up was not long enough to show a difference in the need for revision surgery.
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Affiliation(s)
- P. R. T. Kuzyk
- Department of Orthopaedics, Mount Sinai Hospital, University of Toronto, 600 University Avenue, Toronto, Ontario, Canada M5G 1X5
| | - M. Saccone
- Division of Orthopaedic Surgery, Department of Clinical Epidemiology & Biostatistics, McMaster University, 293 Wellington Street North, Suite 110, Hamilton, Ontario, Canada L8L 2X2
| | - S. Sprague
- Division of Orthopaedic Surgery, Department of Clinical Epidemiology & Biostatistics, McMaster University, 293 Wellington Street North, Suite 110, Hamilton, Ontario, Canada L8L 2X2
| | - N. Simunovic
- Division of Orthopaedic Surgery, Department of Clinical Epidemiology & Biostatistics, McMaster University, 293 Wellington Street North, Suite 110, Hamilton, Ontario, Canada L8L 2X2
| | - M. Bhandari
- Division of Orthopaedic Surgery, Department of Clinical Epidemiology & Biostatistics, McMaster University, 293 Wellington Street North, Suite 110, Hamilton, Ontario, Canada L8L 2X2
| | - E. H. Schemitsch
- Department of Orthopaedics, St Michael’s Hospital, University of Toronto, 55 Queen Street, Suite 800, Toronto, Ontario, Canada M5C 1R6
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