Regensburg 2022 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 26: Superconductivity: Tunnelling and Josephson Junctions
TT 26.2: Vortrag
Donnerstag, 8. September 2022, 09:45–10:00, H10
Quantum interference in a 1d array of three-terminal Josephson junctions — •Johanna Berger1, Christian Baumgartner1, Lorenz Fuchs1, Sergei Gronin2, Geoff Gardner2, Michael Manfra2, Nicola Paradiso1, and Christoph Strunk1 — 1Experimental and Applied Physics, University of Regensburg (Germany) — 2Purdue University, West Lafayette, Indiana (USA)
We present DC transport measurements of an 1d array of three-terminal Josephson junctions based upon an epitaxial Al-InAs heterostructure. Two terminals are connected via a superconducting loop. Under the influence of perpendicular magnetic fields the critical current displays a complex diffraction pattern resembling the superposition of a Fraunhofer pattern-like envelope and SQUID oscillations. In the presence of an additional in-plane magnetic field this pattern develops two asymmetries: The main lobe shows clear supercurrent diode behavior [1], which results in different critical currents depending on the applied current direction. With increasing in-plane magnetic field the diffraction pattern acquires an overall skewness with respect to the perpendicular magnetic field, leading to differently pronounced side lobes. Unlike the diode effect this skewness is not suppressed at higher magnetic fields.
[1] C. Baumgartner et. al., Nat. Nanotechnol. 17, 39 (2022)