Berlin 2018 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 95: Cold Atomic Gases, Superfluids, Quantum Fluids and Solids

TT 95.7: Vortrag

Donnerstag, 15. März 2018, 16:45–17:00, HFT-FT 131

Anisotropic superfluidity of two-dimensional excitons in a periodic potential — •Pavel A. Volkov¹, Igor L. Kurbakov², and Yurii E. Lozovik^2,3 — ¹Theoretische Physik III, Ruhr-Universität Bochum, D-44780 Bochum, Germany — ²Institute of Spectroscopy RAS, Moscow, Troitsk, Russia — ³MIEM, National Research University Higher School of Economics, Moscow, Russia

Electrostatic potentials created with nanofabricated electrodes provide a versatile tool to control and probe excitonic systems. As a particular case, we consider the emergence of anisotropy of superfluid properties in a two-dimensional system of dipolar excitons subject to an external periodic potential. We study anisotropies of helicity modulus, excitation spectrum, sound velocity and angle-resolved luminescence spectrum. We discuss possible experiments that could detect these effects and provide estimates of their magnitude for GaAs/AlGaAs heterostructures as well as MoS₂/hBN/MoS₂ and MoSe₂/hBN/WSe₂ transition metal dichalcogenide bilayers.