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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 invariantsLorenz Fuchs1, •Denis Kochan2, Christian Baumgartner1, Simon Reinhardt1, Sergei Gronin3, Geoffrey Gardner3, Tyler Tyler Lindemann4, Michael Manfra3, Christoph Strunk1, and Nicola Paradiso11Institut 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.

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