Collection of indirect excitons in a diamond-shaped electrostatic trap

TL;DR

This paper introduces a novel diamond-shaped electrostatic trap for excitons, enabling collection, cooling, and formation of a dense, cold exciton gas through disorder screening and a smooth confining potential.

Contribution

It presents the design and realization of a new electrostatic trap for excitons, including elevated traps for evaporative cooling, advancing control over exciton gases.

Findings

Excitons are collected towards the trap center with increasing density.

Screening of disorder leads to a smooth parabolic potential.

A cold, dense exciton gas is achieved at the trap center.

Abstract

We report on the principle and realization of a new trap for excitons -- the diamond electrostatic trap -- which uses a single electrode to create a confining potential for excitons. We also create elevated diamond traps which permit evaporative cooling of the exciton gas. We observe collection of excitons towards the trap center with increasing exciton density. This effect is due to screening of disorder in the trap by the excitons. As a result, the diamond trap behaves as a smooth parabolic potential which realizes a cold and dense exciton gas at the trap center.