Effects of strong correlations for 2D Bose-Einstein condensed dipolar excitons

TL;DR

This study uses quantum Monte Carlo simulations to demonstrate that 2D dipolar excitons exhibit strong correlations, leading to notable deviations from ideal behavior, condensate depletion, and distinct structural features.

Contribution

It provides the first ab initio evidence that dipolar excitons are strongly correlated, challenging previous assumptions of weak interactions.

Findings

Significant deviations in excitation spectra from Bogoliubov theory

Large depletion of the Bose condensate

Presence of peaks in the structure factor indicating short-range order

Abstract

By doing quantum Monte Carlo ab initio simulations we show that dipolar excitons, which are now under experimental study, actually are strongly correlated systems. Strong correlations manifest in significant deviations of excitation spectra from the Bogoliubov one, large Bose condensate depletion, short-range order in the pair correlation function, and peak(s) in the structure factor.