SKM 2023 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 20: Superconductivity: Tunnelling and Josephson Junctions
TT 20.8: Vortrag
Dienstag, 28. März 2023, 11:30–11:45, HSZ 103
Vortex phase transitions in frustrated two-dimensional semiconductor-superconductor Josephson junction arrays — •Simon Reinhardt1, Christian Baumgartner1, Sergei Gronin2, Geoffrey C. Gardner2, Tyler Lindemann2, Michael J. Manfra2, Tatyana I. Baturina1, Nicola Paradiso1, and Christoph Strunk1 — 1Institute for Experimental and Applied Physics, University of Regensburg, 93040 Regensburg, Germany — 2Purdue University, West Lafayette, Indiana 47907, USA
We study two-dimensional Josephson junction arrays in hybrid aluminum/InGaAs/InAs semiconductor-superconductor heterostructures. Using a cold resonator technique, we measure both the inductive response as well as the DC transport properties of the array. A perpendicular magnetic field induces highly ordered vortex configurations for integer and fractional values of the frustration parameter. In the vicinity of the matching fields we observe pronounced dip-to-peak transitions of the differential resistance as a function of current bias, which have previously been interpreted as signatures of a non-equilibrium vortex Mott transition [1]. The scaling behaviour of the differential conductance in our array of ballistic SNS junctions is compared with previous results on diffusive Josephson junction arrays.
1 N. Poccia et al., Science 349, 1202 (2015)