SKM 2021 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 8: Focus Session: Emerging Phenomena in Superconducting Low Dimensional Hybrid Systems II
TT 8.10: Vortrag
Dienstag, 28. September 2021, 16:00–16:15, H7
Vortex inductance as a probe of symmetry breaking in Rashba superconductors — Lorenz Fuchs1, Denis Kochan1, Simon Reinhardt1, Christian Baumgartner1, Sergei Gronin2, Geoffrey Gardner2, Tyler Lindemann2, Michael Manfra2, Christoph Strunk1, and •Nicola Paradiso1 — 1University of Regensburg (Germany) — 2Purdue University (USA)
In this work, we demonstrate the use of vortices as directional probes of the superconducting condensate symmetry via vortex inductance measurements. We investigate Al/InAs heterostructures containing a high-mobility InAs quantum well that is proximitized by the epitaxially grown Al top layer. In out-of-plane magnetic field, ac-current-driven oscillations of vortices around pinning centers give rise to an additional inductance, which is orders of magnitude larger than the bare kinetic inductance of the superfluid. We find that the application of an additional in-plane magnetic field induces a surprising increase of the pinning potential and demonstrate that such increase obeys a characteristic two-fold anisotropy when changing the angle between the in-plane field and the ac-current. The observed counter-intuitive behavior can be theoretically explained by introducing Lifshitz-invariant terms (resulting from the Rashba interaction and the in-plane field) in the Ginzburg-Landau free energy.