Non-Hermitian topological photonics

Author:

Nasari Hadiseh1,Pyrialakos Georgios G.2ORCID,Christodoulides Demetrios N.1,Khajavikhan Mercedeh1

Affiliation:

1. University of Southern California

2. University of Central Florida

Abstract

Recent years have witnessed a flurry of research activities in topological photonics, predominantly driven by the prospect for topological protection–a property that endows such systems with robustness against local defects, disorder, and perturbations. This field emerged in fermionic environments and primarily evolved within the framework of quantum mechanics which is by nature a Hermitian theory. However, in light of the ubiquitous presence of non-Hermiticity in a host of natural and artificial settings, one of the most pressing questions today is how non-Hermiticity may affect some of the predominant features of topological arrangements and whether or not novel topological phases may arise in non-conservative and out of equilibrium systems that are open to the environment. Here, we provide a brief overview of recent developments and ongoing efforts in this field and present our perspective on future directions and potential challenges. Special attention will be given to the interplay of topology and non-Hermiticity–an aspect that could open up new frontiers in physical sciences and could lead to promising opportunities in terms of applications in various disciplines of photonics.

Funder

Air Force Office of Scientific Research

Office of Naval Research

Defense Advanced Research Projects Agency

National Science Foundation

W. M. Keck Foundation

United States-Israel Binational Science Foundation

Simons Foundation

Air Force Research Laboratory

Qatar National Research Fund

Publisher

Optica Publishing Group

Subject

Electronic, Optical and Magnetic Materials

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