Regensburg 2022 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 22: Unconventional Superconductors
TT 22.7: Talk
Wednesday, September 7, 2022, 16:45–17:00, H10
Anisotropic vortex squeezing in Rashba superconductors: a manifestation of Lifshitz invariants — Lorenz Fuchs1, •Denis Kochan2, Christian Baumgartner1, Simon Reinhardt1, Sergei Gronin3, Geoffrey Gardner3, Tyler Tyler Lindemann4, Michael Manfra3, Christoph Strunk1, and Nicola Paradiso1 — 1Institut für Experimentelle und Angewandte Physik, University of Regensburg, 930 40 Regensburg, Germany — 2Institut für Theoretische Physik, University of Regensburg, 930 40 Regensburg, Germany — 3Microsoft Quantum Purdue, Purdue University, West Lafayette, Indiana 47907 USA — 4Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907 USA
Most of 2D superconductors are of type II, i.e., they are penetrated by quantized vortices when exposed to out-of-plane magnetic fields. In a presence of a supercurrent, a Lorentz-like force acts on the vortices, leading to drift and dissipation. The current-induced vortex motion is impeded by pinning at defects. Usually, the pinning strength decreases upon any type of pair-breaking interaction perturbs a system.
In the talk we will discuss surprising experimental evidences showing an unexpected enhancement of pinning in synthetic Rashba 2D superconductors when applying an in-plane magnetic field. When rotating the in-plane component of the field with respect to the driving current, the vortex inductance turns out to be highly anisotropic. We explain this phenomenon as a direct manifestation of Lifshitz invariant that is allowed in the Ginzburg-Landau free energy by symmetry when space-inversion and time-reversal symmetries are broken.