Signatures of spin-orbit interaction in the kinetic inductance of epitaxial Al/InAs heterostructures | Leandro Tosi (CAB-CNEA (Bariloche Atomic Center) | Argentina)

Simon Feyrer1, Vjeko Dimi1, Alexander Kirchner1, Sergei Gronin2, Geoff Gardner2, Tyler Lindemann2, Michael Manfra2, Gabriel Ruiz Rodriguez3, Carlos Balseiro3, Liliana Arrachea3, Marco Aprili4, Nicola Paradiso1, Christoph Strunk1 and Leandro Tosi1,3

1 Institute of Experimental and Applied Physics, University of Regensburg, Germany
2 Purdue University, West Lafayette, Indiana, USA
3 Centro Atmico Bariloche, Comisin Nacional de Energa Atmica, Argentina
4 Laboratoire Physique des Solides, Universit Paris-Saclay, France

In this talk I will present microwave measurements of lumped element resonators taylored in a two-dimensional epitaxial Al/InAs heterostructure, which exhibits strong spin-orbit coupling and induced superconductivity. The resonators consist of narrow wires oriented along different crystal axes acting as inductors, in parallel with large interdigitated capacitors. The kinetic inductance of the wires dominates the microwave response of the resonators, which can be precisely oriented with respect to an applied in-plane magnetic field. We observe an anisotropic frequency shift and a dependence on magnetic field strength that deviates from the behavior expected by considering orbital pair-breaking alone. According to our theoretical model, these observations are consistent with the effect of spin-orbit interaction and with the emergence of Bogoliubov Fermi surfaces [1,2].

[1] Detecting induced p +ip pairing at the Al-InAs interface with a quantum microwave circuit, D. Phan, J. Senior, A. Ghazaryan, M. Hatefipour, W. M. Strickland, J. Shabani, M. Serbyn, and A. P. Higginbotham, Phys. Rev. Lett. 128, 107701 (2022).
[2] Proximity-induced gapless superconductivity in two-dimensional Rashba semiconductor in magnetic field, Serafim S. Babkin, Andrew P. Higginbotham, and Maksym Serbyn, arXiv:2311.09347.