Regensburg 2022 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 25: Poster 1

HL 25.98: Poster

Mittwoch, 7. September 2022, 18:00–20:00, P2

Electrical characterization of core/shell GaAs/InAs/Al nanowire-based Josephson junctions — •Farah Basaric1, Anton Faustmann1, Marvin M. Jansen1, Alexander Pawlis1,2, Erik Zimmermann1, Hans Lüth1,2, Detlev Grützmacher1,2, and Thomas Schäpers1,21Peter Grünberg Institut (PGI-9), Forschungszentrum Jülich, 52425 Jülich, Germany — 2JARA-Fundamentals of Future Information Technology, Jülich-Aachen Research Alliance, Forschungszentrum Jülich and RWTH Aachen University, Germany

Epitaxially grown phase-pure GaAs/InAs core/shell nanowires offer uniformity in their electrical, mechanical and optical properties. High electron mobility, large g-factor and strong Rashba spin-orbit coupling in combination with phase-pure wurtzite GaAs core offer heterostructure with transport properties governed by the presence of confined states in the InAs shell. A Josephson junction was realized by wet chemical etching of an in-situ deposited Al half-shell. Clean semiconductor-superconductor interface by such deposition was important for obtaining high critical current and good electrical transport control. The nanowire system was fabricated fully in-situ in a state-of-the-art nanofabrication clustertool, enabling precisely defined interfaces. Magnetotransport measurements at variable temperature regime were carried out for structures with normal and superconducting contacts under applied in-plane magnetic field, with varying gate potential. Such hybrid structure represents a promising candidate in realizing superconducting qubits and Majorana circuits.

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