Exciton polariton critical non-Hermitian skin effect with spin-momentum-locked gains

TL;DR

This paper proposes a novel method to induce a critical non-Hermitian skin effect in exciton polaritons within a microcavity system, utilizing spin-momentum-locked gain and cavity detuning, enabling phase transition control without a lattice.

Contribution

It introduces a new scheme to realize the critical non-Hermitian skin effect in a continuous exciton polariton system using spin-momentum-locked gain and cavity detuning.

Findings

Achieved critical skin effect without lattice structures.

Identified a measurable order parameter for phase transition.

Demonstrated critical behavior associated with cavity detuning.

Abstract

The critical skin effect, an intriguing phenomenon in non-Hermitian systems, displays sensitivity to system size and manifests distinct dynamical behaviors. In this work, we propose a novel scheme to achieve the critical non-Hermitian skin effect of exciton polaritons in an elongated microcavity system. We show that by utilising longitudinal-transverse spin splitting and spin-momentum-locked gain, a critical non-Hermitian skin effect can be achieved in a continuous system without the need of an underlying lattice. We find that a phase transition can be induced by changing the cavity detuning with respect to the exciton energy. We identify a measurable order parameter associated with this phase transition and demonstrate the corresponding critical behavior. Our work offers a flexible approach to manipulate non-Hermitian phases of exciton polaritons, thereby expanding the potential applications of polaritonic devices.