Superfluidity and collective properties of excitonic polaritons in gapped graphene in a microcavity

TL;DR

This paper predicts the formation, superfluidity, and collective properties of excitonic polaritons in gapped graphene within a microcavity, highlighting how the energy gap influences superfluid density and phase transition temperature.

Contribution

It introduces a theoretical framework for excitonic polaritons in gapped graphene microcavities, including Rabi splitting and superfluidity analysis, which is novel for this material system.

Findings

Superfluid density decreases with increasing energy gap.

The phase transition temperature is reduced as the energy gap widens.

Rabi splitting is calculated for excitons in gapped graphene.

Abstract

We predict the formation and superfluidity of polaritons in an optical microcavity formed by excitons in gapped graphene embedded there and microcavity photons. The Rabi splitting related to the creation of an exciton in a graphene layer in the presence of the band gap is obtained. The analysis of collective excitations as well as the sound velocity is presented. We show that the superfluid density and temperature of the Kosterlitz-Thouless phase transition are decreasing functions of the energy gap.