Floquet insulators and lattice fermions

• URL: http://arxiv.org/abs/2306.16463v2
• Date: Mon, 10 Jul 2023 19:23:32 GMT
• Title: Floquet insulators and lattice fermions
• Authors: Thomas Iadecola, Srimoyee Sen, Lars Sivertsen
• Abstract summary: Floquet insulators are periodically driven quantum systems that can host novel topological phases as a function of the drive parameters. We make this suggestion concrete by mapping the spectrum of a noninteracting (1+1)D Floquet insulator for certain drive parameters onto that of a discrete-time lattice fermion theory with a time-independent Hamiltonian.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Floquet insulators are periodically driven quantum systems that can host novel topological phases as a function of the drive parameters. These new phases exhibit features reminiscent of fermion doubling in discrete-time lattice fermion theories. We make this suggestion concrete by mapping the spectrum of a noninteracting (1+1)D Floquet insulator for certain drive parameters onto that of a discrete-time lattice fermion theory with a time-independent Hamiltonian. The resulting Hamiltonian is distinct from the Floquet Hamiltonian that generates stroboscopic dynamics. It can take the form of a discrete-time Su-Schrieffer-Heeger model with half the number of spatial sites of the original model, or of a (1+1)D Wilson-Dirac theory with one quarter of the spatial sites.

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