Floquet theory of photoinduced topological phase transitions in the organic salt α-(BEDT-TTF)2I3 irradiated with elliptically polarized light

Keisuke Kitayama, Yasuhiro Tanaka, Masao Ogata, Masahito Mochizuki

Research output: Contribution to journalArticlepeer-review

Abstract

We theoretically investigate possible photoinduced topological phase transitions in the organic salt α-(BEDT-TTF)2I3, which possesses a pair of inclined massless Dirac-cone bands between the conduction and valence bands under uniaxial pressure. The Floquet analyses of a driven tight-binding model for this material reveal rich photoinduced variations of band structures, Chern numbers, and Hall conductivities under irradiation with elliptically polarized light. The obtained phase diagrams contain a variety of nonequilibrium steady phases, e.g., the Floquet Chern insulator, Floquet semimetal, and Floquet normal insulator phases. This work widens a scope of target materials for research on photoinduced topological phase transitions and contributes to development of research on the optical manipulations of electronic states in matters.

Original languageEnglish
Article number104705
Journaljournal of the physical society of japan
Volume90
Issue number10
DOIs
Publication statusPublished - 2021 Oct 15

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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