Controlled Drift of Indirect Excitons in Coupled Quantum Wells: Toward Bose Condensation in a Two-Dimensional Trap

TL;DR

This paper demonstrates trapping indirect excitons in coupled quantum wells using stress and electric fields, achieving conditions favorable for Bose condensation in two dimensions.

Contribution

It introduces a method to trap indirect excitons in a harmonic potential, enabling high-density conditions for potential Bose condensation.

Findings

Excitons exhibit a Stark shift over 60 meV.

Long exciton lifetime of 100 ns was achieved.

High diffusivity of 1000 cm²/s was observed.

Abstract

We have succeeded in trapping indirect excitons in coupled quantum wells in a harmonic potential minimum via inhomogeneous applied stress and electric field. These excitons exhibit a strong Stark shift (over 60 meV), long lifetime (100 ns), and high diffusivity (1000 cm$^2$/s). This approach is very promising for obtaining the high exciton density needed for Bose condensation of excitons in two dimensions.