Work

Floquet Higher-Order Topological Insulators with Anomalous Dynamical Polarization

Year: 2020

Type: article

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.

Source: Physical Review Letters

DOI: 10.1103/physrevlett.124.216601

Authors: Biao Huang, W. Vincent Liu

Institutions: University of Pittsburgh, Shanghai Jiao Tong University, Southern University of Science and Technology, Shanghai Research Center for Quantum Sciences

Language: English

Topic: Topological Materials and Phenomena

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funders: Science and Technology Commission of Shanghai Municipality, Air Force Office of Scientific Research

Awards: G2726629340, G438544507