Floquet topological phase transitions in a kicked Haldane-Chern insulator
| Autor: | Jayendra N. Bandyopadhyay, Tridev Mishra, Tapomoy Guha Sarkar, Anurag Pallaprolu |
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| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Floquet theory
Physics Phase transition Condensed Matter - Mesoscale and Nanoscale Physics Point reflection FOS: Physical sciences Topology 01 natural sciences 010305 fluids & plasmas Magnetic field Brillouin zone Amplitude Hall effect 0103 physical sciences Mesoscale and Nanoscale Physics (cond-mat.mes-hall) Condensed Matter::Strongly Correlated Electrons 010306 general physics Phase diagram |
| Popis: | We consider a periodically $\delta$-kicked Haldane type Chern insulator with the kicking applied in the $\hat{z}$ direction. This is known to behave as an inversion symmetry breaking perturbation, since it introduces a time-dependent staggered sub-lattice potential. We study here the effects of such driving on the topological phase diagram of the original Haldane model of a Hall effect in the absence of a net magnetic field. The resultant Floquet band topology is again that of a Chern insulator with the driving parameters, frequency and amplitude, influencing the inversion breaking mass $M$ of the undriven Haldane model. A family of such, periodically related, `Semenoff masses' is observed to occur which support a periodic repetition of Haldane like phase diagrams along the inversion breaking axis of the phase plots. Out of these it is possible to identify two in-equivalent masses in the reduced zone scheme of the Floquet quasienergies, which form the centres of two inequivalent phase diagrams. Further, variation in the driving amplitude's magnitude alone is shown to effect the topological properties by linearly shifting the phase diagram of the driven model about the position of the undriven case. A phenomenon that allows the study of Floquet topological phase transitions in the system. Finally, we also discuss some issues regarding the modifications to Haldane's condition for preventing band overlaps at the Dirac point touchings in the Brillouin zone, in the presence of kicking. Comment: 14 pages, 5 figures, Accepted for publication in Phys. Rev. B |
| Databáze: | OpenAIRE |
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