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TT: Fachverband Tiefe Temperaturen
TT 36: Superconductivity: Theory I
TT 36.12: Talk
Wednesday, March 20, 2024, 12:30–12:45, H 3005
Proximity-induced gapless superconductivity in two-dimensional Rashba semiconductor in magnetic field — •Serafim Babkin1, Andrew Higginbotham1,2, and Maksym Serbyn1 — 1Institute of Science and Technology Austria (ISTA), Am Campus 1, 3400 Klosterneuburg, Austria — 2The James Franck Institute and Department of Physics, University of Chicago, Chicago, Illinois 60637, USA
Two-dimensional semiconductor-superconductor heterostructures form the foundation of numerous nanoscale physical systems. However, measuring the properties of such heterostructures, and characterizing the semiconductor in-situ is challenging. Motivated by experiments, we introduce a theoretical model describing a disordered semiconductor with strong spin-orbit coupling that is proximitized by a superconductor. Our model provides specific predictions for the density of states and superfluid density. Presence of disorder leads to the emergence of a gapless superconducting phase, that may be viewed as a manifestation of Bogoliubov Fermi surface. When applied to real experimental data, our model showcases excellent quantitative agreement, enabling the extraction of material parameters such as mean free path and mobility, and estimating g-tensor after taking into account the orbital contribution of magnetic field. Our model can be used to probe in-situ parameters of other superconductor-semiconductor heterostructures and can be further extended to give access to transport properties.
Keywords: 2D heterostructures; Proximity effect; Rashba spin-orbit coupling; Non-magnetic disorder