Floquet Higher-Order Topological Insulators with Anomalous Dynamical Polarization

Physical Review Letters
Biao Huang, W Vincent Liu

Abstract

Higher-order topological insulators (HOTIs) have emerged as a new class of phases, whose robust in-gap "corner" modes arise from the bulk higher-order multipoles beyond the dipoles in conventional topological insulators. Here, we incorporate Floquet driving into HOTIs, and report for the first time a dynamical polarization theory with anomalous nonequilibrium multipoles. Further, a proposal to detect not only corner states but also their dynamical origin in cold atoms is demonstrated, with the latter one never achieved before. Experimental determination of anomalous Floquet corner modes is also proposed.

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Citations

Mar 23, 2021·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Ruchira V Bhat, Soumya Bera
Oct 15, 2021·Nature Communications·Jiabin YuZhi-Da Song

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