TY - JOUR

T1 - Dynamical Phase Transitions in the Photodriven Charge-Ordered Dirac-Electron System

AU - Tanaka, Yasuhiro

AU - Mochizuki, Masahito

N1 - Funding Information:
This work was partly supported by JSPS KAKENHI (Grants No. 20K03841 and No. 20H00337) and Waseda University Grant for Special Research Projects (Projects No. 2020C-269 and No. 2021C-566). A part of the numerical simulations was performed at the Supercomputer Center of the ISSP, the University of Tokyo.
Publisher Copyright:
© 2022 American Physical Society.

PY - 2022/7/22

Y1 - 2022/7/22

N2 - We study photoinduced phase transitions and charge dynamics in the interacting Dirac-electron system with a charge-ordered ground state theoretically by taking an organic salt α-(BEDT-TTF)2I3. By analyzing the extended Hubbard model for this compound using a combined method of numerical simulations based on the time-dependent Schrödinger equation and the Floquet theory, we observe successive dynamical phase transitions from the charge-ordered insulator to a gapless Dirac semimetal and, eventually, to a Chern insulator phase under irradiation with circularly polarized light. These phase transitions occur as a consequence of two major effects of circularly polarized light, i.e., closing of the charge gap through melting the charge order and opening of the topological gap by breaking the time-reversal symmetry at the Dirac points. We demonstrate that these photoinduced phenomena are governed by charge dynamics of driven correlated Dirac electrons.

AB - We study photoinduced phase transitions and charge dynamics in the interacting Dirac-electron system with a charge-ordered ground state theoretically by taking an organic salt α-(BEDT-TTF)2I3. By analyzing the extended Hubbard model for this compound using a combined method of numerical simulations based on the time-dependent Schrödinger equation and the Floquet theory, we observe successive dynamical phase transitions from the charge-ordered insulator to a gapless Dirac semimetal and, eventually, to a Chern insulator phase under irradiation with circularly polarized light. These phase transitions occur as a consequence of two major effects of circularly polarized light, i.e., closing of the charge gap through melting the charge order and opening of the topological gap by breaking the time-reversal symmetry at the Dirac points. We demonstrate that these photoinduced phenomena are governed by charge dynamics of driven correlated Dirac electrons.

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U2 - 10.1103/PhysRevLett.129.047402

DO - 10.1103/PhysRevLett.129.047402

M3 - Article

C2 - 35939024

AN - SCOPUS:85135547273

SN - 0031-9007

VL - 129

JO - Physical Review Letters

JF - Physical Review Letters

IS - 4

M1 - 047402

ER -