Floquet Exceptional Topological Insulator

Autor:	Dash, Gaurab Kumar, Bid, Subhajyoti, Thakurathi, Manisha
Rok vydání:	2023
Předmět:	Condensed Matter - Mesoscale and Nanoscale Physics Condensed Matter - Strongly Correlated Electrons Quantum Physics
Zdroj:	Phys. Rev. B 109, 035418 (2024)
Druh dokumentu:	Working Paper
DOI:	10.1103/PhysRevB.109.035418
Popis:	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. Comment: 18 pages, 12 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2301.13119 Zobrazit plný text záznamu View this record from Arxiv