[qmeso-seminar] семинар 26 января

[Quantum Mesoscopics Dept.]

СЕМИНАР СЕКТОРА КВАНТОВОЙ МЕЗОСКОПИКИ

пятница 26 января, 15:00, онлайн



S. S. Babkin, A. P. Higginbotham, M. Serbyn

Proximity-induced gapless superconductivity in two-dimensional Rashba semiconductor in magnetic field



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. A recent experimental study [arXiv:2107.03695] was able to probe the semiconductor within the
heterostructure using microwave measurements of the superfluid density. This work revealed a rapid depletion of
superfluid density in semiconductor, caused by the in-plane magnetic field which in presence of spin-orbit coupling
creates so-called Bogoliubov Fermi surfaces. The experimental work used a simplified theoretical model that neglected
the presence of non-magnetic disorder in the semiconductor, hence describing the data only qualitatively. 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.

https://arxiv.org/abs/2311.09347



[Трансляция: https://zoom.us/j/96948399564?pwd=RXlKbW96Qm1tZEV6SHB0Q2JYeTdrdz09]

подробнее: http://qmeso.itp.ac.ru/seminars.php?abstract=true