# Anti-chiral edge states in an exciton polariton strip

## TL;DR

This paper proposes a method to generate anti-chiral edge states in an exciton-polariton honeycomb lattice, where both edges support modes propagating in the same direction, with robustness against disorder demonstrated through simulations.

## Contribution

It introduces a novel scheme to realize anti-chiral edge states in exciton-polariton systems with strip geometry, highlighting the effects of resonant pumping and polarization.

## Key findings

- Edge modes propagate in the same direction on both edges.
- Edge states are robust against disorder due to spatial separation.
- Resonant pumping induces energy shifts and tilts in dispersion.

## Abstract

We present a scheme to obtain anti-chiral edge states in an exciton-polariton honeycomb lattice with strip geometry, where the modes corresponding to both edges propagate in the same direction. Under resonant pumping the effect of a polariton condensate with nonzero velocity in one linear polarization is predicted to tilt the dispersion of polaritons in the other, which results in an energy shift between two Dirac cones and the otherwise flat edge states become tilted. Our simulations show that due to the spatial separation from the bulk modes the edge modes are robust against disorder.