Electrostatic traps for dipolar excitons

TL;DR

This paper explores the design of electrostatic traps for dipolar excitons, analyzing how interactions and electric fields limit density and lifetime, and proposing optimal geometries for high-density trapping to facilitate Bose-Einstein condensation.

Contribution

It provides an analytic framework for understanding how trap geometry influences exciton density and lifetime, guiding the design of effective traps for excitonic condensation.

Findings

Maximal exciton density and lifetime depend on trap geometry.

Analytic estimates of density and lifetime are derived.

Optimal trap designs are suggested for Bose-Einstein condensation.

Abstract

We consider the design of two-dimensional electrostatic traps for dipolar indirect excitons. We show that the excitons dipole-dipole interaction, combined with the in-plane electric fields that arise due to the trap geometry, constrain the maximal density and lifetime of trapped excitons. We derive an analytic estimate of these values and determine their dependence on the trap geometry, thus suggesting the optimal design for high density trapping as a route for observing excitonic Bose-Einstein condensation.