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- W3102675982 abstract "In this study, a tight-binding model on square octagon lattice with nearest-neighbour and next-nearest-neighbour hoppings is considered. The system is topologically trivial although it exhibits quadratic band-touching points in its band-structure. It is shown that the system drives towards topologically non-trivial phases as soon as it is exposed to monochromatic circularly polarized light. Multiple topological phases are found to emerge with the variation of amplitude of light. An effective time-independent Hamiltonian of the system is obtained following the Floquet-Bloch formulation. Quasi-energy band-structures along with definite values of Chern numbers for respective bands are obtained. Characterization of topological phases are made in terms of band structure and Chern numbers. In addition, Hall conductance and topologically protected chiral edge states are obtained to explain the topological properties. Density of states is obtained in every case. The system undergoes a series of topological phase transitions among various topological phases upon variations of both amplitude of light and hopping strengths. It exhibits Chern insulating and Chern semimetallic phases depending on the values of lattice filling." @default.
- W3102675982 created "2020-11-23" @default.
- W3102675982 creator A5057680774 @default.
- W3102675982 creator A5064879796 @default.
- W3102675982 date "2019-04-04" @default.
- W3102675982 modified "2023-09-26" @default.
- W3102675982 title "Emergence of photo-induced multiple topological phases on square-octagon lattice" @default.
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- W3102675982 doi "https://doi.org/10.1088/1361-648x/ab1026" @default.
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