Floquet Exceptional Topological Insulator

Abstract

We propose a novel way of modulating exceptional topology by implementing Floquet engineering in non-hermitian (NH) systems. We introduce Floquet exceptional topological insulator which results from shining light on a conventional three-dimensional NH topological insulator. Lightmatter interaction facilitates the quantum phases of matter to exhibit a novel phenomenon, where, the point gaps in the bulk host surface states. These distinct surface states either fill the point gap in the complex eigenspectrum or exhibit exceptional points in the presence of a magnetic field. We also highlight the existence of a quantum anomaly generated by photo-induced modulation. The existence of the Floquet biorthogonal Chern number and spectral winding number show that the momentum slices exhibit NH skin effect, even though the system as a whole does not. We also employ wave-dynamics evolution to illustrate the NH surface skin effect.

18 pages, 12 figures

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• Uniform response theory of non-Hermitian systems: Non-Hermitian physics beyond the exceptional point
• Fingerprint of Non-Hermiticity in d-wave Altermagnet
• Exceptional second-order topological insulators
• Floquet topological phases with time-reversal and space inversion symmetries and dynamical detection of topological charges
• Breakdown of Non-Bloch Bulk-Boundary Correspondence and Emergent Topology in Floquet Non-Hermitian Systems
• Floquet multiple exceptional points with higher-order skin effect
• Liouvillian topology and nonreciprocal dynamics in open Floquet chains
• Non-Hermitian second-order topological insulator with point gap