Effective Mass in Dissipative Coupled Polaritons

TL;DR

This paper investigates how dissipative and coherent couplings influence the effective mass and non-Hermitian phenomena in polariton systems, revealing conditions for negative mass, exceptional points, and bound states.

Contribution

It provides a comprehensive parametric analysis of dissipative effects in polaritons, identifying conditions for non-Hermitian phenomena and extending understanding of light-matter interactions.

Findings

Identification of conditions for negative effective mass

Analytical characterization of exceptional points

Analysis of bound states in the continuum

Abstract

Dissipative coupling refers to the effect where two systems interact with each other mediated by dissipation channels. Recent advances in controlling light-matter systems have opened new avenues to explore non-Hermitian effects arising from dissipative coupling, such as level attraction and anomalous dispersions. In this work, we perform a parametric study of these effects in a polariton system, i.e., a light-matter superposition, under both dissipative and coherent coupling. We characterize the effects of different sources of non-Hermitian behavior and analytically identify the conditions for the emergence of negative effective mass, exceptional points, and bound states in the continuum as a function of the light-matter detuning, the coherent-to-dissipative coupling ratio, and the relative decay rate of the non-interacting subsystems. We also analyze the classical limit of the polariton system within a non-Hermitian framework, employing coherent states.