Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 16: Poster Session Superconductivity, Cryogenic Particle Detectors, Cryotechnique

TT 16.20: Poster

Montag, 16. März 2020, 15:00–19:00, P2/EG

Josephson inductance of epitaxial Al-InAs-based Josephson junction arrays — •Christian Baumgartner1, Linus Fresz1, Lorenz Fuchs1, Geoffrey Gardner2,3, Michael Manfra2,3, Nicola Paradiso1, and Christoph Strunk11Institute for Experimental and Applied Physics, University of Regensburg, Germany — 2Station Q Purdue, Purdue University, West Lafayette, Indiana 47907, USA — 3Department of Physics and Astronomy, Purdue University, West Lafayette, Indiana 47907,USA

We study one-dimensional Josephson junction arrays (JJAs) in epitaxial Al/InAs/InGaAs heterostructures. Our measurement circuit allows us to measure simultaneously the Josephson inductance and the DC transport characteristics. Both are measured as a function of the magnetic field vector, temperature, gate voltage or direct current. We find that the critical current determined at the equilibrium from the Josephson inductance is significantly larger than the transport critical current. This latter is, in fact, determined by the weakest link, whereas the Josephson inductance is insensitive to defects in the JJA. Interestingly, the measurement of the Josephson inductance makes it possible to directly reconstruct part of the current-phase relation, and therefore deviations from the sinusoidal dependence. The present method offers a new approach to investigate the nature of topological Josephson junctions.

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DPG-Physik > DPG-Verhandlungen > 2020 > Dresden