Floquet Theory of Photoinduced Topological Phase Transitions in the Organic Salt α-(BEDT-TTF)₂I₃ Irradiated with Elliptically Polarized Light

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We theoretically investigate possible photoinduced topological phase transitions in the organic salt $��$-(BEDT-TTF)$_2$I$_3$, 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.

14 pages, 9 figures, to be published in Journal of the Physical Society of Japan

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