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Photoinduced topological phase transitions in the Dirac-electron systems haveattracted intensive research interest since its theoretical prediction ingraphene, where the application of circularly polarized light opens a gap atthe Dirac points and renders the system a topologically nontrivial Cherninsulator phase through breaking the time-reversal symmetry. However, most ofthe previously studied phenomena in two-dimensional Dirac systems are basicallybased on the same physicical mechanism, i.e., the gap opening in the Diracelectron bands with circularly polarized light, and it is lacking in variety ofthe physics. In this paper, we theoretically predict a novel type ofphotoinduced topological phase transition accompanied by collision and collapseof gapped Dirac points in the organic salt $\alpha$-(BEDT-TTF)$_2$I$_3$. Byconstructing the Floquet theory for this compound, we demonstrate that theirradiation of elliptically polarized light causes collision of the Diracpoints through the photoinduced band deformation and their collapse, whicheventually results in the topological phase transition from a topologicalsemimetal with gapped Dirac cones to a normal insulator when the ellipticalaxis is oriented at a specfic angle with respect to the crystallographic axes.We argue that this novel photoinduced phase transition can be experimentallydetected by the measurement of Hall conductivity. The present work enriches thefundamental physics of photoinduced topological phase transitions and thuscontribute to development of this rapidly growing research field.

journal of the physical society of japan

Predicted novel type of photoinduced topological phase transition  accompanied by collision and collapse of Dirac-cone pair in organic salt  $\alpha$-(BEDT-TTF)$_2$I$_3$