Gauge-field rotation of 2D exciton Bose condensate in double quantum well by radial magnetic field

TL;DR

A radial magnetic field can induce rotation and vortex formation in a 2D exciton Bose condensate within a double quantum well, affecting its photoluminescence and providing a method to observe exciton condensation.

Contribution

This work demonstrates that magnetic fields can be used to control and detect exciton Bose condensation through vortex penetration and photoluminescence changes.

Findings

Vortices penetrate the exciton cloud at a critical magnetic field.

Rotation affects the intensity and angular distribution of photoluminescence.

Magnetic field-induced rotation can serve as an experimental signature of exciton Bose condensation.

Abstract

Here it is shown that a radial magnetic field leads to rotation of a Bose condensed exciton cloud due to Aharonov-Bohm effect for an electron and a hole forming an exciton. As in the case of mechanical rotation of superfluids, rotation is accompanied by penetration of vortices into the cloud at some critical magnetic field. Penetration of vortices strongly affects the total intensity and the angular distribution of photoluminescence from the exciton cloud. This effect can be used for an effective experimental manifestation of exciton Bose condensation.