Time-dependent Gutzwiller simulation of Floquet topological superconductivity
arXiv:2309.06069 · doi:10.1038/s42005-024-01586-w
Abstract
Periodically driven systems provide a novel route to control the topology of quantum materials. In particular, Floquet theory allows an effective band description of periodically-driven systems through the Floquet Hamiltonian. Here, we study the time evolution of -wave superconductors irradiated with intense circularly-polarized laser light. We consider the Floquet - model with time-periodic interactions, and investigate its mean-field dynamics by formulating the time-dependent Gutzwiller approximation. We observe the development of the -wave pairing amplitude along with the original -wave order upon gradual increasing of the field amplitude. We further numerically construct the Floquet Hamiltonian for the steady state, with which we identify the system as the fully-gapped superconducting phase with a nonzero Chern number. We explore the low-frequency regime where the perturbative approaches in the previous studies break down, and find that the topological gap of an experimentally-accessible size can be achieved at much lower laser intensities.
arXiv comment12 pages, 7 figures
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