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

Yasuhiro Tanaka*, Masahito Mochizuki

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Original languageEnglish
Article number047402
JournalPhysical Review Letters
Volume129
Issue number4
DOIs
Publication statusPublished - 2022 Jul 22

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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