Effects of intra-layer correlations on electron-hole double-layer superfluidity
Abstract
We investigate the correlations acting within the layers in a superfluid system of electron-hole spatially separated layers. In this system of quasi-dipoles, the dominant correlations are Hartree--Fock. We find in the BEC regime of the superfluid where screening is negligible, that the effect of the correlations on superfluid properties is also negligible. However, in the BCS-BEC crossover regime, where the screening plays a crucial role, we find that the superfluid gap is significantly weakened because the correlations significantly boost the number of low-energy particle-hole excitations participating in the screening process. Finally, the intralayer correlations are found in this system to suppress a predicted phenomenon in which the average pair size passes through a minimum as the crossover regime is traversed. In the presence of intralayer correlations, the minimum is either extremely weak or completely absent.
Cite
@article{arxiv.2310.12117,
title = {Effects of intra-layer correlations on electron-hole double-layer superfluidity},
author = {Filippo Pascucci and Sara Conti and Andrea Perali and Jacques Tempere and David Neilson},
journal= {arXiv preprint arXiv:2310.12117},
year = {2024}
}