Work

Bulk–edge correspondence and trapping at a non-Hermitian topological interface

Year: 2021

Type: article

Abstract: In Hermitian systems, according to the bulk-edge correspondence, interfacing two topological optical media with different bulk topological numbers implies the existence of edge states, which can trap light at the interface. However, such a general scenario can be violated when dealing with non-Hermitian systems. Here we show that interfacing two semi-infinite Hatano-Nelson chains with different bulk topological numbers can result in the existence of infinitely many edge (interface) states; however, light waves cannot be rather generally trapped at the interface.

Source: Optics Letters

DOI: 10.1364/ol.445437

Author: Stefano Longhi

Institutions: Institute for Cross-Disciplinary Physics and Complex Systems, Politecnico di Milano

Language: English

Topic: Quantum Mechanics and Non-Hermitian Physics

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: bronze

Funder: Agencia Estatal de Investigación

Award: G2373305540