Direct Optical Excitation of Quantum-Degenerate Exciton States in Semiconductors

TL;DR

This paper predicts that incoherent light can directly generate stable, quantum-degenerate exciton states in semiconductors, exhibiting long-range order and unique luminescence properties, which could be experimentally observed.

Contribution

It introduces a quantum electrodynamic framework showing incoherent light can efficiently produce quantum-degenerate excitons with long-range order in semiconductors.

Findings

Incoherent light can generate excitons with zero center of mass momentum.

The exciton states exhibit long-range order and stability.

Distinct directional and density-dependent luminescence signatures are predicted.

Abstract

Quantum electrodynamic calculations predict that truly incoherent light can be used to efficiently generate quantum-degenerate exciton population states. Resonant incoherent excitation directly converts photons into excitons with vanishing center of mass momentum. The populated exciton state possesses long-range order, is very stable against perturbations, and should be observable via its unusual directional and density dependence in luminescence measurements.