Excitons in Electrostatic Traps

TL;DR

This paper proposes a novel electrostatic trap design for indirect excitons in coupled quantum wells, effectively confining excitons while suppressing dissociative in-plane electric fields, supported by theoretical calculations and experimental validation.

Contribution

It introduces a new trap design that overcomes the obstacle of in-plane electric fields, enabling effective exciton confinement in electrostatic traps.

Findings

Successful suppression of in-plane electric fields.

Effective confinement of indirect excitons demonstrated.

Theoretical calculations support experimental results.

Abstract

We consider in-plane electrostatic traps for indirect excitons in coupled quantum wells, where the traps are formed by a laterally modulated gate voltage. An intrinsic obstacle for exciton confinement in electrostatic traps is an in-plane electric field that can lead to exciton dissociation. We propose a design to suppress the in-plane electric field and, at the same time, to effectively confine excitons in the electrostatic traps. We present calculations for various classes of electrostatic traps and experimental proof of principle for trapping of indirect excitons in electrostatic traps.