Floquet theory of photoinduced topological phase transitions in the organic salt $\alpha$-(BEDT-TTF)${}_2$I${}_3$ irradiated with elliptically polarized light

Abstract

We theoretically investigate possible photoinduced topological phase transitions in the organic salt $\alpha$-(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

References in corpus (12)

• Photovoltaic Hall effect in graphene
• Topological characterization of periodically-driven quantum systems
• Photo-Induced Topological Phase Transition and a Single Dirac-Cone State in Silicene
• Correlated electron systems periodically driven out of equilibrium: Floquet + DMFT formalism
• Nonequilibrium Steady State of Photoexcited Correlated Electrons in the Presence of Dissipation
• Quadratic band touching points and flat bands in two-dimensional topological Floquet systems
• Topological edge states and quantum Hall effect in the Haldane model
• Sub-Cycle Optical Response Caused by Dressed State with Phase-Locked Wavefunctions
• Laser-irradiated Kondo insulators : Controlling Kondo effect and topological phases
• Theory of the Inverse Faraday Effect due to the Rashba Spin-Oribt Interactions: Roles of Band Dispersions and Fermi Surfaces
• Chern Insulator Phase in a Lattice of an Organic Dirac Semimetal with Intracellular Potential and Magnetic Modulations
• Predicted Photo-Induced Topological Phases in Organic Salt $\alpha$-(BEDT-TTF)${}_2$I${}_3$