The exciton-polariton properties of hexagonal BN based microcavity and their potential applications in BEC and superconductivity

TL;DR

This paper investigates the properties of exciton-polaritons in hexagonal boron nitride microcavities, demonstrating their potential for room-temperature Bose-Einstein condensation and superconducting device applications.

Contribution

It introduces a model combining ab initio and Bethe-Salpeter calculations to analyze exciton-polaritons in hBN microcavities, highlighting their suitability for optoelectronic and superconducting technologies.

Findings

Room temperature exciton-polariton BEC is feasible in hBN microcavities.

Large exciton binding energy supports stable excitons at high temperatures.

Potential for exciton-polariton mediated superconductivity at moderate temperatures.

Abstract

Microcavity exciton-polaritons are two-dimensional bosonic quasiparticles composed by excitons and photons. Using model Hamiltonian with parameters generated from ab initio density-functional theory and Bathe-Salpeter Equation calculations, we investigate the exciton and the exciton-polariton properties of hexagnonal boron nitride (hBN) based microcavity. We show that hBN based microcavities, including monolayer and all-dielectric ones, are promising in optoelectronic applications. Room temperature exciton-polariton Bose-Einstein Condensation can be achieved because of the large oscillating strength and binding energy of the exciton, and the strong interaction between the exciton-polaritons and the longitudinal optical phonons. Based on this BEC state, exciton-polariton mediated superconducting device can also be fabricated at such moderate temperatures using the microcavity structure proposed by Laussy et al.