Detecting Josephson effect in the excitonic condensate by coherent emission of light

TL;DR

This paper proposes a method to detect the Josephson effect in excitonic condensates through coherent light emission, which is highly sensitive to phase differences and can reveal quantum coherence properties.

Contribution

It introduces a novel approach to observe the Josephson effect in excitonic Bose-Einstein condensates via light emission patterns, considering both dipole- and quadrupole-active excitons.

Findings

Emission pattern redistribution depends on Josephson phase

Coherent emission can be canceled or enhanced by phase control

Method applicable to different exciton types

Abstract

Coherent emission of light by a split excitonic Bose-Einstein condensate -- excitonic Josephson junction -- can be extremely sensitive to the Josephson phase established across the junction. As a result of this, the emission can be redistributed between different directions and even cancelled. The cases of the dipole- and of the quadrupole-active excitons are considered.