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Position |
Associate Professor |
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Research Field |
Natural Science / Semiconductors, optical properties of condensed matter and atomic physics, Natural Science / Magnetism, superconductivity and strongly correlated systems |
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Homepage URL |
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External Link |
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Graduating School 【 display / non-display 】
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The University of Tokyo Faculty of Science Graduated
2003.4 - 2007.3
Graduate School 【 display / non-display 】
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The University of Tokyo Graduate School, Division of Science Doctor's Course Completed
2009.4 - 2012.3
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The University of Tokyo Graduate School, Division of Science Master's Course Completed
2007.4 - 2009.3
Studying abroad experiences 【 display / non-display 】
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2018.9-2020.3
Max Planck Institute for the Physics of Complex Systems
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2015.9-2018.9
University of Geneva
Campus Career 【 display / non-display 】
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KONAN UNIVERSITY Faculty of Science and Engineering Faculty of Science and Engineering Department of Physics Associate Professor
2020.4
External Career 【 display / non-display 】
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Max Planck Institute for the Physics of Complex Systems
2018.9 - 2020.3
Country：Germany
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Max Planck Institute for the Physics of Complex Systems
2018.9 - 2020.3
Country：Germany
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University of Geneva Department of Quantum Matter Physics
2015.9 - 2018.9
Country：Switzerland
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The University of Tokyo School of Science, Department of Physics
2015.5 - 2015.8
Country：Japan
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National Institute for Materials Science
2013.4 - 2015.4
Country：Japan
Papers 【 display / non-display 】
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Phase transitions and spin dynamics of the quasi-one dimensional Ising-like antiferromagnet BaCo2V2O8 in a longitudinal magnetic field Reviewed International coauthorship
Shintaro Takayoshi, Quentin Faure, Virginie Simonet, Béatrice Grenier, Sylvain Petit, Jacques Ollivier, Pascal Lejay, Thierry Giamarchi
Physical Review Research 5 ( 2 ) 023205 2023.6
Authorship：Lead author, Corresponding author Publisher：American Physical Society (APS)
DOI： 10.1103/physrevresearch.5.023205
Other Link： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevResearch.5.023205/fulltext
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Spin, Charge, and η-Spin Separation in One-Dimensional Photodoped Mott Insulators Reviewed International coauthorship
Yuta Murakami, Shintaro Takayoshi, Tatsuya Kaneko, Andreas M. Läuchli, Philipp Werner
Physical Review Letters 130 ( 10 ) 106501 2023.3
Publisher：American Physical Society (APS)
DOI： 10.1103/PhysRevLett.130.106501
Other Link： https://link.aps.org/article/10.1103/PhysRevLett.130.106501
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Mott memristors based on field-induced carrier avalanche multiplication Reviewed International coauthorship
Francesco Peronaci, Sara Ameli, Shintaro Takayoshi, Alexandra S. Landsman, Takashi Oka
Physical Review B 107 ( 7 ) 075154 2023.2
Publisher：American Physical Society (APS)
DOI： 10.1103/PhysRevB.107.075154
Other Link： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevB.107.075154/fulltext
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Dynamical conductivity of disordered quantum chains Reviewed International coauthorship
Shintaro Takayoshi, Thierry Giamarchi
The European Physical Journal D 76 ( 11 ) 213 2022.11
Authorship：Lead author Publisher：Springer Science and Business Media LLC
Abstract
We study the transport properties of a one-dimensional quantum system with disorder. We numerically compute the frequency dependence of the conductivity of a fermionic chain with nearest-neighbor interaction and a random chemical potential by using the Chebyshev matrix product state (CheMPS) method. As a benchmark, we investigate the noninteracting case first. Comparison with exact diagonalization and analytical solutions demonstrates that the results of CheMPS are reliable over a wide range of frequencies. We then calculate the dynamical conductivity spectra of the interacting system for various values of the interaction and disorder strengths. In the high-frequency regime, the conductivity decays as a power law, with an interaction-dependent exponent. This behavior is qualitatively consistent with the bosonized field theory predictions, although the numerical evaluation of the exponent shows deviations from the analytically expected values. We also compute the characteristic pinning frequency at which a peak in the conductivity appears. We confirm that it is directly related to the inverse of the localization length, even in the interacting case. We demonstrate that the localization length follows a power law of the disorder strength with an exponent dependent on the interaction, and find good quantitative agreement with the field theory predictions. In the low-frequency regime, we find a behavior consistent with the one of the noninteracting system $$\omega ^{2}(\ln \omega )^{2}$$ independently of the interaction. We discuss the consequences of our finding for experiments in cold atomic gases.
Graphical abstractDOI： 10.1140/epjd/s10053-022-00524-1
Other Link： https://link.springer.com/article/10.1140/epjd/s10053-022-00524-1/fulltext.html
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Second-order magnetic responses in quantum magnets: Magnetization under ac magnetic fields Reviewed International coauthorship
Tatsuya Kaneko, Yuta Murakami, Shintaro Takayoshi, Andrew J. Millis
Physical Review B 105 ( 19 ) 195126 2022.5
Publisher：American Physical Society (APS)
We investigate second-order magnetic responses of quantum magnets against ac magnetic fields. We focus on the case where the z component of the spin is conserved in the unperturbed Hamiltonian and the driving field is applied in the xy plane. We find that linearly polarized driving fields induce a second-harmonic response, while circularly polarized fields generate only a zero-frequency response, leading to a magnetization with a direction determined by the helicity. Employing an unbiased numerical method, we demonstrate the nonlinear magnetic effect driven by the circularly polarized field in the XXZ model and show that the magnitude of the magnetization can be predicted by the dynamical spin structure factor in the linear response regime.
DOI： 10.1103/physrevb.105.195126
Other Link： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevB.105.195126/fulltext
Review Papers (Misc) 【 display / non-display 】
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コタイ ブツリ 〈 キタエフスピン エキタイ ノ シン テンカイ 〉 トクシュウゴウ ; ダイナミクス ト シンキ ブッセイ
57 ( 11 ) 713 - 724 2022.11
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Laser control of magnonic topological phases in antiferromagnets
Nakata Kouki, Kim Se Kwon, Takayoshi Shintaro
Meeting Abstracts of the Physical Society of Japan 75.1 1372 - 1372 2020
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Spinon confinement and quantum phase transition in quasi-one-dimensional antiferromagnets
Takayoshi Shintaro, Furuya Shunsuke C., Giamarchi Thierry
Meeting Abstracts of the Physical Society of Japan 74.1 1215 - 1215 2019
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Field theoretical approach to the entanglement spectrum of AKLT states
Tanaka Akihiro, Takayoshi Shintaro
Meeting Abstracts of the Physical Society of Japan 72 ( 0 ) 2419 - 2419 2017
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Theoretical Study towards Ultrafast Spintronics
Sato Masahiro, Takayoshi Shintaro, Oka Takashi
Butsuri 72 ( 11 ) 783 - 792 2017
Publisher：The Physical Society of Japan
<p>In this article, we explain our theoretical proposals, ultrafast ways of controlling magnetic properties of solid (magnetization, spin chirality, spin currents, etc.) by laser. We first review the Floquet theorem, which is useful for the prediction of novel laser-induced phenomena, then we turn to our recent results. We cover the following topics: laser-induced magnetization growing process, laser-driven spin chirality and spin current in multiferroics, and topological spin liquid state realized by laser in the honeycomb Kitaev model.</p>
Presentations 【 display / non-display 】
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量子磁性体における非線形光学応答の理論 Invited
高吉 慎太郎
日本物理学会2022年秋季大会 2022.9
Event date： 2022.9
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レーザー駆動超高速スピントロニクスの理論 Invited
高吉 慎太郎
日本物理学会第77回年次大会 2022.3
Event date： 2022.3
Grant-in-Aid for Scientific Research 【 display / non-display 】
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Theoretical study of quantum computation in topological magnets
2022.4 - 2025.3
JSPS Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research(B)
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Search for novel states in disordered systems induced by external field driving
2021.4 - 2024.3
JSPS Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research(C)