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Regular version of the site

Article

Anisotropic superfluidity of two-dimensional excitons in a periodic potential

Physical Review B: Condensed Matter and Materials Physics. 2017. Vol. 95. No. 24-5430. P. 245430-1-245430-19.
Yu. E. Lozovik, I. L. K., Pavel A. V.

We study anisotropies of the 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 MoS2/hBN/MoS2 and MoSe2/hBN/WSe2 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.