Wigner supersolid of excitons in electron-hole bilayers

TL;DR

This paper proposes the existence of a Wigner supersolid phase in electron-hole bilayers, where excitons form a phase-coherent Wigner crystal due to dipolar interactions, expanding understanding of quantum phases in such systems.

Contribution

It introduces the concept of a Wigner supersolid in bilayer electron-hole systems and discusses its properties and potential experimental signatures.

Findings

Qualitative phase diagram of bilayer system with Wigner supersolid

Discussion of properties and signatures of the Wigner supersolid

Theoretical argument for phase coherence and crystalline order coexistence

Abstract

Bilayer electron-hole systems, where carriers in one layer are electrons and carriers in the other are holes, have been actively investigated in recent years with the focus on Bose-Einstein condensation of excitons. This condensation is expected to occur when the layer separation d is much smaller than the interparticle distance r_sa_B within each layer. In this Brief Report, we argue for the existence of a state, Wigner supersolid, in which excitons are phase-coherent but form a Wigner crystal due to dipolar repulsion. We present the qualitative phase diagram of a bilayer system, and discuss properties and possible signatures of the Wigner supersolid phase.