1
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Kim YJ, Mendes JL, Michelsen JM, Shin HJ, Lee N, Choi YJ, Cushing SK. Coherent charge hopping suppresses photoexcited small polarons in ErFeO 3 by antiadiabatic formation mechanism. SCIENCE ADVANCES 2024; 10:eadk4282. [PMID: 38507483 PMCID: PMC10954221 DOI: 10.1126/sciadv.adk4282] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/22/2023] [Accepted: 02/13/2024] [Indexed: 03/22/2024]
Abstract
Polarons are prevalent in condensed matter systems with strong electron-phonon coupling. The adiabaticity of the polaron relates to its transport properties and spatial extent. To date, only adiabatic small polaron formation has been measured following photoexcitation. The lattice reorganization energy is large enough that the first electron-optical phonon scattering event creates a small polaron without requiring substantial carrier thermalization. We measure that frustrating the iron-centered octahedra in the rare-earth orthoferrite ErFeO3 leads to antiadiabatic polaron formation. Coherent charge hopping between neighboring Fe3+─Fe2+ sites is measured with transient extreme ultraviolet spectroscopy and lasts several picoseconds before the polaron forms. The resulting small polaron formation time is an order of magnitude longer than previous measurements and indicates a shallow potential well, even in the excited state. The results emphasize the importance of considering dynamic electron-electron correlations, not just electron-phonon-induced lattice changes, for small polarons for transport, catalysis, and photoexcited applications.
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Affiliation(s)
- Ye-Jin Kim
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA 91125, USA
| | - Jocelyn L. Mendes
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA 91125, USA
| | - Jonathan M. Michelsen
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA 91125, USA
| | - Hyun Jun Shin
- Department of Physics, Yonsei University, Seoul 03722, Republic of Korea
| | - Nara Lee
- Department of Physics, Yonsei University, Seoul 03722, Republic of Korea
| | - Young Jai Choi
- Department of Physics, Yonsei University, Seoul 03722, Republic of Korea
| | - Scott K. Cushing
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA 91125, USA
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2
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Amuah EB, Siddiqui KM, Monti M, Johnson AS, Wall SE. Determination and correction of spectral phase from principal component analysis of coherent phonons. OPTICS EXPRESS 2024; 32:3817-3825. [PMID: 38297594 DOI: 10.1364/oe.514141] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/23/2023] [Accepted: 01/11/2024] [Indexed: 02/02/2024]
Abstract
Measuring the spectral phase of a pulse is key for performing wavelength resolved ultrafast measurements in the few femtosecond regime. However, accurate measurements in real experimental conditions can be challenging. We show that the reflectivity change induced by coherent phonons in a quantum material can be used to infer the spectral phase of an optical probe pulse with few-femtosecond accuracy.
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3
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Li X, Ning H, Mehio O, Zhao H, Lee MC, Kim K, Nakamura F, Maeno Y, Cao G, Hsieh D. Keldysh Space Control of Charge Dynamics in a Strongly Driven Mott Insulator. PHYSICAL REVIEW LETTERS 2022; 128:187402. [PMID: 35594087 DOI: 10.1103/physrevlett.128.187402] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/24/2021] [Revised: 02/20/2022] [Accepted: 04/11/2022] [Indexed: 06/15/2023]
Abstract
The fate of a Mott insulator under strong low frequency optical driving conditions is a fundamental problem in quantum many-body dynamics. Using ultrafast broadband optical spectroscopy, we measured the transient electronic structure and charge dynamics of an off-resonantly pumped Mott insulator Ca_{2}RuO_{4}. We observe coherent bandwidth renormalization and nonlinear doublon-holon pair production occurring in rapid succession within a sub-100-fs pump pulse duration. By sweeping the electric field amplitude, we demonstrate continuous bandwidth tuning and a Keldysh crossover from a multiphoton absorption to quantum tunneling dominated pair production regime. Our results provide a procedure to control coherent and nonlinear heating processes in Mott insulators, facilitating the discovery of novel out-of-equilibrium phenomena in strongly correlated systems.
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Affiliation(s)
- Xinwei Li
- Institute for Quantum Information and Matter, California Institute of Technology, Pasadena, California 91125, USA
- Department of Physics, California Institute of Technology, Pasadena, California 91125, USA
| | - Honglie Ning
- Institute for Quantum Information and Matter, California Institute of Technology, Pasadena, California 91125, USA
- Department of Physics, California Institute of Technology, Pasadena, California 91125, USA
| | - Omar Mehio
- Institute for Quantum Information and Matter, California Institute of Technology, Pasadena, California 91125, USA
- Department of Physics, California Institute of Technology, Pasadena, California 91125, USA
| | - Hengdi Zhao
- Department of Physics, University of Colorado, Boulder, Colorado 80309, USA
| | - Min-Cheol Lee
- Center for Integrated Nanotechnologies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
- Center for Correlated Electron Systems, Institute for Basic Science, Seoul 08826, Republic of Korea
| | - Kyungwan Kim
- Department of Physics, Chungbuk National University, Cheongju, Chungbuk 28644, Republic of Korea
| | - Fumihiko Nakamura
- Department of Education and Creation Engineering, Kurume Institute of Technology, Fukuoka 830-0052, Japan
| | - Yoshiteru Maeno
- Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
| | - Gang Cao
- Department of Physics, University of Colorado, Boulder, Colorado 80309, USA
| | - David Hsieh
- Institute for Quantum Information and Matter, California Institute of Technology, Pasadena, California 91125, USA
- Department of Physics, California Institute of Technology, Pasadena, California 91125, USA
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4
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Wang X, Engel RY, Vaskivskyi I, Turenne D, Shokeen V, Yaroslavtsev A, Granas O, Knut R, Schunck JOO, Dziarzhytski S, Brenner G, Wang RP, Kuhlmann M, Kuschewski F, Bronsch W, Schüßler-Langeheine C, Styervoyedov A, Parkin SS, Parmigiani F, Eriksson O, Beye M, Durr H. Ultrafast manipulation of the NiO antiferromagnetic order via sub-gap optical excitation. Faraday Discuss 2022; 237:300-316. [DOI: 10.1039/d2fd00005a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Wide-band-gap insulators such as NiO offer the exciting prospect of coherently manipulating electronic correlations with strong optical fields. Contrary to metals where rapid dephasing of optical excitation via electronic processes...
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5
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Fabiani G, Bouman MD, Mentink JH. Supermagnonic Propagation in Two-Dimensional Antiferromagnets. PHYSICAL REVIEW LETTERS 2021; 127:097202. [PMID: 34506161 DOI: 10.1103/physrevlett.127.097202] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2021] [Revised: 05/18/2021] [Accepted: 07/15/2021] [Indexed: 06/13/2023]
Abstract
We investigate the propagation of magnons after ultrashort perturbations of the exchange interaction in the prototype two-dimensional Heisenberg antiferromagnet. Using the recently proposed neural quantum states, we predict highly anisotropic spreading in space constrained by the symmetry of the perturbation. Interestingly, the propagation speed at the shortest length scale and timescale is up to 40% higher than the highest magnon velocity. We argue that the enhancement stems from extraordinary strong magnon-magnon interactions, suggesting new avenues for manipulating information transfer on ultrashort length scales and timescales.
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Affiliation(s)
- G Fabiani
- Radboud University, Institute for Molecules and Materials (IMM) Heyendaalseweg 135, 6525 AJ Nijmegen, Netherlands
| | - M D Bouman
- Radboud University, Institute for Molecules and Materials (IMM) Heyendaalseweg 135, 6525 AJ Nijmegen, Netherlands
| | - J H Mentink
- Radboud University, Institute for Molecules and Materials (IMM) Heyendaalseweg 135, 6525 AJ Nijmegen, Netherlands
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6
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Mishchenko AS, Tupitsyn IS, Nagaosa N, Prokof'ev N. Fermi blockade of the strong electron-phonon interaction in modelled optimally doped high temperature superconductors. Sci Rep 2021; 11:9699. [PMID: 33958643 PMCID: PMC8102534 DOI: 10.1038/s41598-021-89059-w] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2021] [Accepted: 04/16/2021] [Indexed: 11/09/2022] Open
Abstract
We study how manifestations of strong electron-phonon interaction depend on the carrier concentration by solving the two-dimensional Holstein model for the spin-polarized fermions using an approximation free bold-line diagrammatic Monte Carlo method. We show that the strong electron-phonon interaction, obviously present at very small Fermion concentration, is masked by the Fermi blockade effects and Migdal's theorem to the extent that it manifests itself as moderate one at large carriers densities. Suppression of strong electron-phonon interaction fingerprints is in agreement with experimental observations in doped high temperature superconductors.
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Affiliation(s)
- Andrey S Mishchenko
- RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama, 351-0198, Japan.
| | - Igor S Tupitsyn
- Department of Physics, University of Massachusetts, Amherst, MA, 01003, USA
| | - Naoto Nagaosa
- RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama, 351-0198, Japan.,Department of Applied Physics, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan
| | - Nikolay Prokof'ev
- Department of Physics, University of Massachusetts, Amherst, MA, 01003, USA
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7
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Glerean F, Jarc G, Marciniak A, Giusti F, Sparapassi G, Montanaro A, Rigoni EM, Tollerud JO, Fausti D. Time-resolved multimode heterodyne detection for dissecting coherent states of matter. OPTICS LETTERS 2020; 45:3498-3501. [PMID: 32630881 DOI: 10.1364/ol.394661] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/27/2020] [Accepted: 05/28/2020] [Indexed: 06/11/2023]
Abstract
Unveiling and controlling the time evolution of the momentum and position of low energy excitations such as phonons, magnons, and electronic excitation is the key to attain coherently driven new functionalities of materials. Here we report the implementation of femtosecond time- and frequency-resolved multimode heterodyne detection and show that it allows for independent measurement of the time evolution of the position and momentum of the atoms in coherent vibrational states in α-quartz. The time dependence of the probe field quadratures reveals that their amplitude is maximally changed when the atoms have maximum momentum, while their phase encodes a different information and evolves proportionally to the instantaneous atomic positon. We stress that this methodology, providing the mean to map both momentum and position in one optical observable, may be of relevance for both quantum information technologies and time-domain studies on complex materials.
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8
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Ultrafast magnetic dynamics in insulating YBa 2Cu 3O 6.1 revealed by time resolved two-magnon Raman scattering. Nat Commun 2020; 11:2548. [PMID: 32439836 PMCID: PMC7242324 DOI: 10.1038/s41467-020-16275-9] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2019] [Accepted: 04/24/2020] [Indexed: 11/08/2022] Open
Abstract
Measurement and control of magnetic order and correlations in real time is a rapidly developing scientific area relevant for magnetic memory and spintronics. In these experiments an ultrashort laser pulse (pump) is first absorbed by excitations carrying electric dipole moment. These then give their energy to the magnetic subsystem monitored by a time-resolved probe. A lot of progress has been made in investigations of ferromagnets but antiferromagnets are more challenging. Here, we introduce time-resolved two-magnon Raman scattering as a real time probe of magnetic correlations especially well-suited for antiferromagnets. Its application to the antiferromagnetic charge transfer insulator YBa2Cu3O6.1 revealed rapid demagnetization within 90 fs of photoexcitation. The relaxation back to thermal equilibrium is characterized by much slower timescales. We interpret these results in terms of slow relaxation of the charge sector and rapid equilibration of the magnetic sector to a prethermal state characterized by parameters that change slowly as the charge sector relaxes.
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9
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Abstract
The role of the crystal lattice for the electronic properties of cuprates and other high-temperature superconductors remains controversial despite decades of theoretical and experimental efforts. While the paradigm of strong electronic correlations suggests a purely electronic mechanism behind the insulator-to-metal transition, recently the mutual enhancement of the electron-electron and the electron-phonon interaction and its relevance to the formation of the ordered phases have also been emphasized. Here, we combine polarization-resolved ultrafast optical spectroscopy and state-of-the-art dynamical mean-field theory to show the importance of the crystal lattice in the breakdown of the correlated insulating state in an archetypal undoped cuprate. We identify signatures of electron-phonon coupling to specific fully symmetric optical modes during the buildup of a three-dimensional (3D) metallic state that follows charge photodoping. Calculations for coherently displaced crystal structures along the relevant phonon coordinates indicate that the insulating state is remarkably unstable toward metallization despite the seemingly large charge-transfer energy scale. This hitherto unobserved insulator-to-metal transition mediated by fully symmetric lattice modes can find extensive application in a plethora of correlated solids.
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10
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Novelli F, Tollerud JO, Prabhakaran D, Davis JA. Persistent coherence of quantum superpositions in an optimally doped cuprate revealed by 2D spectroscopy. SCIENCE ADVANCES 2020; 6:eaaw9932. [PMID: 32158934 PMCID: PMC7048423 DOI: 10.1126/sciadv.aaw9932] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/13/2019] [Accepted: 12/05/2019] [Indexed: 05/10/2023]
Abstract
Quantum materials displaying intriguing magnetic and electronic properties could be key to the development of future technologies. However, it is poorly understood how the macroscopic behavior emerges in complex materials with strong electronic correlations. While measurements of the dynamics of excited electronic populations have been able to give some insight, they have largely neglected the intricate dynamics of quantum coherence. Here, we apply multidimensional coherent spectroscopy to a prototypical cuprate and report unprecedented coherent dynamics persisting for ~500 fs, originating directly from the quantum superposition of optically excited states separated by 20 to 60 meV. These results reveal that the states in this energy range are correlated with the optically excited states at ~1.5 eV and point to nontrivial interactions between quantum many-body states on the different energy scales. In revealing these dynamics and correlations, we demonstrate that multidimensional coherent spectroscopy can interrogate complex quantum materials in unprecedented ways.
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Affiliation(s)
- Fabio Novelli
- Centre for Quantum and Optical Science, Swinburne University of Technology, Hawthorn, Victoria 3122, Australia
- Department of Physical Chemistry II, Ruhr University Bochum, 44801 Bochum, Germany
| | - Jonathan O. Tollerud
- Centre for Quantum and Optical Science, Swinburne University of Technology, Hawthorn, Victoria 3122, Australia
| | | | - Jeffrey A. Davis
- Centre for Quantum and Optical Science, Swinburne University of Technology, Hawthorn, Victoria 3122, Australia
- ARC Centre of Excellence for Future Low-Energy Electronics Technologies, Swinburne University of Technology, Hawthorn, Victoria 3122, Australia
- Corresponding author.
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11
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Miyamoto T, Matsui Y, Terashige T, Morimoto T, Sono N, Yada H, Ishihara S, Watanabe Y, Adachi S, Ito T, Oka K, Sawa A, Okamoto H. Probing ultrafast spin-relaxation and precession dynamics in a cuprate Mott insulator with seven-femtosecond optical pulses. Nat Commun 2018; 9:3948. [PMID: 30258055 PMCID: PMC6158258 DOI: 10.1038/s41467-018-06312-z] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2018] [Accepted: 08/23/2018] [Indexed: 11/18/2022] Open
Abstract
A charge excitation in a two-dimensional Mott insulator is strongly coupled with the surrounding spins, which is observed as magnetic-polaron formations of doped carriers and a magnon sideband in the Mott-gap transition spectrum. However, the dynamics related to the spin sector are difficult to measure. Here, we show that pump-probe reflection spectroscopy with seven-femtosecond laser pulses can detect the optically induced spin dynamics in Nd2CuO4, a typical cuprate Mott insulator. The bleaching signal at the Mott-gap transition is enhanced at ~18 fs. This time constant is attributable to the spin-relaxation time during magnetic-polaron formation, which is characterized by the exchange interaction. More importantly, ultrafast coherent oscillations appear in the time evolution of the reflectivity changes, and their frequencies (1400-2700 cm-1) are equal to the probe energy measured from the Mott-gap transition peak. These oscillations can be interpreted as the interference between charge excitations with two magnons originating from charge-spin coupling.
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Affiliation(s)
- T Miyamoto
- Department of Advanced Materials Science, University of Tokyo, Chiba, 277-8561, Japan
| | - Y Matsui
- Department of Advanced Materials Science, University of Tokyo, Chiba, 277-8561, Japan
| | - T Terashige
- AIST-UTokyo Advanced Operando-Measurement Technology Open Innovation Laboratory (OPERANDO-OIL), National Institute of Advanced Industrial Science and Technology (AIST), Chiba, 277-8568, Japan
| | - T Morimoto
- Department of Advanced Materials Science, University of Tokyo, Chiba, 277-8561, Japan
| | - N Sono
- Department of Advanced Materials Science, University of Tokyo, Chiba, 277-8561, Japan
| | - H Yada
- Department of Advanced Materials Science, University of Tokyo, Chiba, 277-8561, Japan
| | - S Ishihara
- Department of Physics, Tohoku University, Sendai, 980-8578, Japan
| | - Y Watanabe
- Department of Chemistry, Kyoto University, Kitashirakawa Oiwake-cho, Sakyo-ku, Kyoto, 606-8502, Japan
| | - S Adachi
- Department of Chemistry, Kyoto University, Kitashirakawa Oiwake-cho, Sakyo-ku, Kyoto, 606-8502, Japan
| | - T Ito
- National Institute of Advanced Industrial Science and Technology, Tsukuba, 305-8565, Ibaraki, Japan
| | - K Oka
- National Institute of Advanced Industrial Science and Technology, Tsukuba, 305-8565, Ibaraki, Japan
| | - A Sawa
- National Institute of Advanced Industrial Science and Technology, Tsukuba, 305-8565, Ibaraki, Japan
| | - H Okamoto
- Department of Advanced Materials Science, University of Tokyo, Chiba, 277-8561, Japan.
- AIST-UTokyo Advanced Operando-Measurement Technology Open Innovation Laboratory (OPERANDO-OIL), National Institute of Advanced Industrial Science and Technology (AIST), Chiba, 277-8568, Japan.
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12
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Peli S, Dal Conte S, Comin R, Nembrini N, Ronchi A, Abrami P, Banfi F, Ferrini G, Brida D, Lupi S, Fabrizio M, Damascelli A, Capone M, Cerullo G, Giannetti C. Mottness at finite doping and charge-instabilities in cuprates. NATURE PHYSICS 2017; 13:806-811. [PMID: 28781605 PMCID: PMC5540185 DOI: 10.1038/nphys4112] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2016] [Accepted: 03/27/2017] [Indexed: 05/31/2023]
Abstract
The influence of the Mott physics on the doping-temperature phase diagram of copper oxides represents a major issue that is subject of intense theoretical and experimental effort. Here, we investigate the ultrafast electron dynamics in prototypical single-layer Bi-based cuprates at the energy scale of the O-2p→Cu-3d charge-transfer (CT) process. We demonstrate a clear evolution of the CT excitations from incoherent and localized, as in a Mott insulator, to coherent and delocalized, as in a conventional metal. This reorganization of the high-energy degrees of freedom occurs at the critical doping pcr ≈0.16 irrespective of the temperature, and it can be well described by dynamical mean field theory calculations. We argue that the onset of the low-temperature charge instabilities is the low-energy manifestation of the underlying Mottness that characterizes the p < pcr region of the phase diagram. This discovery sets a new framework for theories of charge order and low-temperature phases in underdoped copper oxides.
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Affiliation(s)
- S Peli
- Department of Mathematics and Physics, Università Cattolica del Sacro Cuore, Brescia I-25121, Italy
- Department of Physics, Università degli Studi di Milano, 20133 Milano, Italy
| | - S Dal Conte
- IFN-CNR, Dipartimento di Fisica, Politecnico di Milano, 20133 Milano, Italy
| | - R Comin
- Quantum Matter Institute, University of British Columbia, Vancouver, BC V6T 1Z4, Canada
- Department of Physics and Astronomy, University of British Columbia, Vancouver, BC V6T 1Z1, Canada
| | - N Nembrini
- Department of Mathematics and Physics, Università Cattolica del Sacro Cuore, Brescia I-25121, Italy
- Department of Physics, Università degli Studi di Milano, 20133 Milano, Italy
| | - A Ronchi
- Department of Mathematics and Physics, Università Cattolica del Sacro Cuore, Brescia I-25121, Italy
- I-LAMP (Interdisciplinary Laboratories for Advanced Materials Physics), Università Cattolica del Sacro Cuore, Brescia I-25121, Italy
- Department of Physics and Astronomy, KU Leuven, Celestijnenlaan 200D, B-3001 Heverlee, Leuven, Belgium
| | - P Abrami
- Department of Mathematics and Physics, Università Cattolica del Sacro Cuore, Brescia I-25121, Italy
- I-LAMP (Interdisciplinary Laboratories for Advanced Materials Physics), Università Cattolica del Sacro Cuore, Brescia I-25121, Italy
| | - F Banfi
- Department of Mathematics and Physics, Università Cattolica del Sacro Cuore, Brescia I-25121, Italy
- I-LAMP (Interdisciplinary Laboratories for Advanced Materials Physics), Università Cattolica del Sacro Cuore, Brescia I-25121, Italy
| | - G Ferrini
- Department of Mathematics and Physics, Università Cattolica del Sacro Cuore, Brescia I-25121, Italy
- I-LAMP (Interdisciplinary Laboratories for Advanced Materials Physics), Università Cattolica del Sacro Cuore, Brescia I-25121, Italy
| | - D Brida
- IFN-CNR, Dipartimento di Fisica, Politecnico di Milano, 20133 Milano, Italy
- Department of Physics and Center for Applied Photonics, University of Konstanz, 78457 Konstanz, Germany
| | - S Lupi
- CNR-IOM Dipartimento di Fisica, Università di Roma La Sapienza P.le Aldo Moro 2, 00185 Rome, Italy
| | - M Fabrizio
- Scuola Internazionale Superiore di Studi Avanzati (SISSA) and CNR-IOM Democritos National Simulation Center, Via Bonomea 265, 34136 Trieste (Italy)
| | - A Damascelli
- Quantum Matter Institute, University of British Columbia, Vancouver, BC V6T 1Z4, Canada
- Department of Physics and Astronomy, University of British Columbia, Vancouver, BC V6T 1Z1, Canada
| | - M Capone
- Scuola Internazionale Superiore di Studi Avanzati (SISSA) and CNR-IOM Democritos National Simulation Center, Via Bonomea 265, 34136 Trieste (Italy)
| | - G Cerullo
- IFN-CNR, Dipartimento di Fisica, Politecnico di Milano, 20133 Milano, Italy
| | - C Giannetti
- Department of Mathematics and Physics, Università Cattolica del Sacro Cuore, Brescia I-25121, Italy
- I-LAMP (Interdisciplinary Laboratories for Advanced Materials Physics), Università Cattolica del Sacro Cuore, Brescia I-25121, Italy
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13
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Iwano K, Shimoi Y, Miyamoto T, Hata D, Sotome M, Kida N, Horiuchi S, Okamoto H. Ultrafast Photoinduced Electric-Polarization Switching in a Hydrogen-Bonded Ferroelectric Crystal. PHYSICAL REVIEW LETTERS 2017; 118:107404. [PMID: 28339275 DOI: 10.1103/physrevlett.118.107404] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/24/2016] [Indexed: 06/06/2023]
Abstract
Croconic acid crystals show proton displacive-type ferroelectricity with a large spontaneous polarization reaching 20 μC/cm^{2}, which originates from the strong coupling of proton and π-electron degrees of freedom. Such a coupling makes us expect a large polarization change by photoirradiations. Optical-pump second-harmonic-generation-probe experiments reveal that a photoexcited croconic-acid crystal loses the ferroelectricity substantially with a maximum quantum efficiency of more than 30 molecules per one absorbed photon. Based on density functional calculations, we theoretically discuss possible pathways toward the formation of a one-dimensional domain with polarization inversion and its recovery process to the ground state by referring to the dynamics of experimentally obtained polarization changes.
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Affiliation(s)
- K Iwano
- Graduate University for Advanced Studies, Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan
| | - Y Shimoi
- Research Center for Computational Design of Advanced Functional Materials, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8568, Japan
| | - T Miyamoto
- Department of Advanced Materials Science, University of Tokyo, Chiba 277-8561, Japan
| | - D Hata
- Department of Advanced Materials Science, University of Tokyo, Chiba 277-8561, Japan
| | - M Sotome
- Department of Advanced Materials Science, University of Tokyo, Chiba 277-8561, Japan
| | - N Kida
- Department of Advanced Materials Science, University of Tokyo, Chiba 277-8561, Japan
| | - S Horiuchi
- Flexible Electronics Research Center, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8565, Japan
| | - H Okamoto
- Department of Advanced Materials Science, University of Tokyo, Chiba 277-8561, Japan
- AIST-UTokyo Advanced Operando-Measurement Technology Open Innovation Laboratory (OPERANDO-OIL), National Institute of Advanced Industrial Science and Technology (AIST), Chiba 277-8568, Japan
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14
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Ultrafast evolution and transient phases of a prototype out-of-equilibrium Mott-Hubbard material. Nat Commun 2017; 8:13917. [PMID: 28067228 PMCID: PMC5228036 DOI: 10.1038/ncomms13917] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2016] [Accepted: 11/10/2016] [Indexed: 11/30/2022] Open
Abstract
The study of photoexcited strongly correlated materials is attracting growing interest since their rich phase diagram often translates into an equally rich out-of-equilibrium behaviour. With femtosecond optical pulses, electronic and lattice degrees of freedom can be transiently decoupled, giving the opportunity of stabilizing new states inaccessible by quasi-adiabatic pathways. Here we show that the prototype Mott–Hubbard material V2O3 presents a transient non-thermal phase developing immediately after ultrafast photoexcitation and lasting few picoseconds. For both the insulating and the metallic phase, the formation of the transient configuration is triggered by the excitation of electrons into the bonding a1g orbital, and is then stabilized by a lattice distortion characterized by a hardening of the A1g coherent phonon, in stark contrast with the softening observed upon heating. Our results show the importance of selective electron–lattice interplay for the ultrafast control of material parameters, and are relevant for the optical manipulation of strongly correlated systems. Ultrafast photoexcitation stabilizes new states of matter with rich out-of-equilibrium behaviours. Here, Lantz et al. report a transient non-thermal phase developing immediately after photoexcitation in V2O3, shedding a light on optical manipulation of strongly correlated systems.
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15
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Kogoj J, Mierzejewski M, Bonča J. Nature of Bosonic Excitations Revealed by High-Energy Charge Carriers. PHYSICAL REVIEW LETTERS 2016; 117:227002. [PMID: 27925751 DOI: 10.1103/physrevlett.117.227002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/21/2016] [Indexed: 06/06/2023]
Abstract
We address a long-standing problem concerning the origin of bosonic excitations that strongly interact with charge carriers. We show that the time-resolved pump-probe experiments are capable of distinguishing between regular bosonic degrees of freedom, e.g., phonons, and the hard-core bosons, e.g., magnons. The ability of phonon degrees of freedom to absorb essentially an unlimited amount of energy renders relaxation dynamics nearly independent of the absorbed energy or fluence. In contrast, the hard core effects pose limits on the density of energy stored in the bosonic subsystems resulting in a substantial dependence of the relaxation time on the fluence and/or excitation energy. Very similar effects can be observed also in a different setup when the system is driven by multiple pulses.
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Affiliation(s)
- Jan Kogoj
- J. Stefan Institute, 1000 Ljubljana, Slovenia
| | | | - Janez Bonča
- J. Stefan Institute, 1000 Ljubljana, Slovenia
- Faculty of Mathematics and Physics, University of Ljubljana, 1000 Ljubljana, Slovenia
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16
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Baldini E, Mann A, Borroni S, Arrell C, van Mourik F, Carbone F. A versatile setup for ultrafast broadband optical spectroscopy of coherent collective modes in strongly correlated quantum systems. STRUCTURAL DYNAMICS (MELVILLE, N.Y.) 2016; 3:064301. [PMID: 27990455 PMCID: PMC5135716 DOI: 10.1063/1.4971182] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/30/2016] [Accepted: 11/16/2016] [Indexed: 06/06/2023]
Abstract
A femtosecond pump-probe setup is described that is optimised for broadband transient reflectivity experiments on solid samples over a wide temperature range. By combining high temporal resolution and a broad detection window, this apparatus can investigate the interplay between coherent collective modes and high-energy electronic excitations, which is a distinctive characteristic of correlated electron systems. Using a single-shot readout array detector at frame rates of 10 kHz allows resolving coherent oscillations with amplitudes <10-4. We demonstrate its operation on the charge-transfer insulator La2CuO4, revealing coherent phonons with frequencies up to 13 THz and providing access into their Raman matrix elements.
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Affiliation(s)
| | - Andreas Mann
- Laboratory for Ultrafast Microscopy and Electron Scattering and the Lausanne Centre for Ultrafast Science , IPHYS, Station 6, École Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
| | - Simone Borroni
- Laboratory for Ultrafast Microscopy and Electron Scattering and the Lausanne Centre for Ultrafast Science , IPHYS, Station 6, École Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
| | - Christopher Arrell
- Laboratory of Ultrafast Spectroscopy and the Lausanne Centre for Ultrafast Science , ISIC, Station 6, École Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
| | - Frank van Mourik
- Laboratory of Ultrafast Spectroscopy and the Lausanne Centre for Ultrafast Science , ISIC, Station 6, École Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
| | - Fabrizio Carbone
- Laboratory for Ultrafast Microscopy and Electron Scattering and the Lausanne Centre for Ultrafast Science , IPHYS, Station 6, École Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
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Jacobs T, Simsek Y, Koval Y, Müller P, Krasnov VM. Sequence of Quantum Phase Transitions in Bi2Sr2CaCu2O(8+δ) Cuprates Revealed by In Situ Electrical Doping of One and the Same Sample. PHYSICAL REVIEW LETTERS 2016; 116:067001. [PMID: 26919010 DOI: 10.1103/physrevlett.116.067001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/23/2015] [Indexed: 06/05/2023]
Abstract
Our recently discovered electrical doping technique allows a broad-range variation of carrier concentration without changing the chemical composition. We show that it is possible to induce superconductivity in a nondoped insulating sample and to tune it reversibly all the way to an overdoped metallic state. This way, we can investigate the whole doping diagram of one and the same sample. Our study reveals two distinct critical points. The one at the overdoped side is associated with the onset of the pseudogap and with the metal-to-insulator transition in the c-axis transport. The other at optimal doping is associated with the appearance of a "dressed" electron energy. Our study confirms the existence of multiple phase transitions under the superconducting dome in cuprates.
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Affiliation(s)
- Th Jacobs
- Department of Physics, Stockholm University, AlbaNova University Center, SE-10691 Stockholm, Sweden
| | - Y Simsek
- Department of Physics, Stockholm University, AlbaNova University Center, SE-10691 Stockholm, Sweden
- Department of Physics, Universität Erlangen-Nürnberg, D-91058 Erlangen, Germany
| | - Y Koval
- Department of Physics, Universität Erlangen-Nürnberg, D-91058 Erlangen, Germany
| | - P Müller
- Department of Physics, Universität Erlangen-Nürnberg, D-91058 Erlangen, Germany
| | - V M Krasnov
- Department of Physics, Stockholm University, AlbaNova University Center, SE-10691 Stockholm, Sweden
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Peronaci F, Schiró M, Capone M. Transient Dynamics of d-Wave Superconductors after a Sudden Excitation. PHYSICAL REVIEW LETTERS 2015; 115:257001. [PMID: 26722940 DOI: 10.1103/physrevlett.115.257001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/03/2015] [Indexed: 06/05/2023]
Abstract
Motivated by recent ultrafast pump-probe experiments on high-temperature superconductors, we discuss the transient dynamics of a d-wave BCS model after a quantum quench of the interaction parameter. We find that the existence of gap nodes, with the associated nodal quasiparticles, introduces a decay channel which makes the dynamics much faster than in the conventional s-wave model. For every value of the quench parameter, the superconducting gap rapidly converges to a stationary value smaller than the one at equilibrium. Using a sudden approximation for the gap dynamics, we find an analytical expression for the reduction of spectral weight close to the nodes, which is in qualitative agreement with recent experiments.
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Affiliation(s)
- Francesco Peronaci
- International School for Advanced Studies (SISSA/ISAS) and CNR-IOM Democritos, Via Bonomea 265, 34136 Trieste, Italy
| | - Marco Schiró
- Institut de Physique Théorique, Université Paris Saclay, CNRS, CEA, F-91191 Gif-sur-Yvette, France
| | - Massimo Capone
- International School for Advanced Studies (SISSA/ISAS) and CNR-IOM Democritos, Via Bonomea 265, 34136 Trieste, Italy
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De Filippis G, Cataudella V, Mishchenko AS, Nagaosa N, Fierro A, de Candia A. Crossover from super- to subdiffusive motion and memory effects in crystalline organic semiconductors. PHYSICAL REVIEW LETTERS 2015; 114:086601. [PMID: 25768773 DOI: 10.1103/physrevlett.114.086601] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/13/2014] [Indexed: 06/04/2023]
Abstract
The transport properties at finite temperature of crystalline organic semiconductors are investigated, within the Su-Schrieffer-Heeger model, by combining an exact diagonalization technique, Monte Carlo approaches, and a maximum entropy method. The temperature-dependent mobility data measured in single crystals of rubrene are successfully reproduced: a crossover from super- to subdiffusive motion occurs in the range 150≤T≤200 K, where the mean free path becomes of the order of the lattice parameter and strong memory effects start to appear. We provide an effective model, which can successfully explain features of the absorption spectra at low frequencies. The observed response to slowly varying electric field is interpreted by means of a simple model where the interaction between the charge carrier and lattice polarization modes is simulated by a harmonic interaction between a fictitious particle and an electron embedded in a viscous fluid.
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Affiliation(s)
- G De Filippis
- SPIN-CNR and Dipartimento di Fisica, Università di Napoli Federico II, I-80126 Napoli, Italy
| | - V Cataudella
- SPIN-CNR and Dipartimento di Fisica, Università di Napoli Federico II, I-80126 Napoli, Italy
| | - A S Mishchenko
- RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama 351-0198, Japan
| | - N Nagaosa
- RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama 351-0198, Japan
- Department of Applied Physics, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - A Fierro
- SPIN-CNR Complesso Universitario di Monte S. Angelo, I-80126 Napoli, Italy
| | - A de Candia
- INFN, SPIN-CNR, and Dipartimento di Fisica, Università di Napoli Federico II, I-80126 Napoli, Italy
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