Dresden 2026 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 73: Superconductivity: Tunneling and Josephson Junctions
TT 73.6: Talk
Thursday, March 12, 2026, 10:45–11:00, CHE/0089
Supercurrent Transport and Shapiro response in phase-pure core/shell GaAs/InAs nanowire-based Josephson junctions — •Farah Basaric1,2, Yurii Kutovy2,3, Alexander Pawlis2,3, Detlev Grützmacher1,2, and Thomas Schäpers1,2 — 1Peter Grünberg Institut (PGI9), Forschungszentrum Jülich, 52425 Jülich, Germany — 2JARA-Fundamentals of Future Information Technology, Jülich-Aachen Research Alliance, Forschungszentrum Jülich and RWTH Aachen University, Germany — 3Peter Grünberg Institut (PGI10), Forschungszentrum Jülich, 52425 Jülich, Germany
We investigate Josephson junctions based on epitaxially grown, phase-pure core/shell GaAs/InAs nanowires comprising closed-loop states in the InAs shell. The core/shell architecture, combined with superconducting Al, enables confined states in the InAs shell that are expected to enhance proximity coupling at the InAs/Al interface. Using shadow-wall evaporation for junction and contact definition, we are able to realize nanowire-based Josephson junctions in the short junction limit. Current-voltage characteristics measurements under radio-frequency irradiation reveal both integer as well as fractional Shapiro steps, the latter commonly associated with ballistic junctions. Additionally, magnetoconductance measurements on nanowires with normal contacts provide insight into the transport properties of the nanowire segment forming the weak link. Together, these results demonstrate that GaAs/InAs core/shell nanowires constitute a very promising platform for future quantum circuits based on hybrid devices.
Keywords: Nanowires; Shapiro steps; Josephson junction; Quantum transport