Dynamical control over the confinement of spatially indirect excitons in electrostatic traps of GaAs coupled quantum wells

TL;DR

This paper presents a method to precisely control the confinement of spatially indirect excitons in GaAs quantum wells using electrostatic traps, enabling manipulation of cold exciton gases with minimal perturbation at very low temperatures.

Contribution

It introduces a novel electronic waveform correction technique for dynamic electric field control in exciton confinement without requiring impedance matching.

Findings

Achieved nanosecond precision in electric field amplitude control.

Demonstrated confinement manipulation of excitons without significant perturbations.

Operated effectively at sub-Kelvin temperatures.

Abstract

We study spatially indirect excitons confined in a 10 $\mu$m wide electrostatic trap of a GaAs double quantum well. We introduce a technique to control the amplitude of the electric field interacting with the excitons electric dipole, with nanosecond precision. Our approach relies on electronic waveforms corrected for the distorsions occurring at highest frequencies so that impedance matching is not necessary. Thus, we manipulate the confinement of cold gases without inducing sizeable perturbations down to sub-Kelvin bath temperatures.