Exciton condensate in semiconductor quantum well structures.

TL;DR

This paper proposes a method to form exciton condensates in semiconductor quantum wells, using mean-field theory to analyze pairing gaps and excitation spectra, with potential for experimental realization at high densities.

Contribution

It introduces a controlled way to create exciton condensates in quantum wells and provides numerical analysis of their properties using mean-field theory.

Findings

Exciton condensate formation is feasible in well-structured quantum wells.

The pairing gap and excitation spectrum are characterized across densities.

High-density condensates have substantial energy scales.

Abstract

We propose that the exciton condensate may form in a well-controlled way in appropriately arranged semiconductor quantum well structures. The mean-field theory of Keldysh and Kopaev, exact in both the high density and the low density limits, is solved numerically to illustrate our proposal. The electron-hole pairing gap and the excitation spectrum of the exciton condensate are obtained. The energy scales of the condensate are substantial at higher densities. We discuss how such densities could be achieved experimentally by generating an effective pressure.