Anisotropic superfluidity of two-dimensional excitons in a periodic potential
Mesoscale and Nanoscale Physics
2017-07-03 v1 Quantum Gases
Abstract
We study anisotropies of helicity modulus, excitation spectrum, sound velocity and angle-resolved luminescence spectrum in a two-dimensional system of interacting excitons in a periodic potential. Analytical expressions for anisotropic corrections to the quantities characterizing superfluidity are obtained. We consider particularly the case of dipolar excitons in quantum wells. For GaAs/AlGaAs heterostructures as well as MoS/hBN/MoS and MoSe/hBN/WSe transition metal dichalcogenide bilayers estimates of the magnitude of the predicted effects are given. We also present a method to control superfluid motion and to determine the helicity modulus in generic dipolar systems.
Keywords
Cite
@article{arxiv.1706.10262,
title = {Anisotropic superfluidity of two-dimensional excitons in a periodic potential},
author = {Yu. E. Lozovik and I. L. Kurbakov and Pavel A. Volkov},
journal= {arXiv preprint arXiv:1706.10262},
year = {2017}
}