Berlin 2024 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 10: Focus Session: Evolution of Topological Materials into Superconducting Nanodevices I (joint session HL/TT)

HL 10.5: Vortrag

Montag, 18. März 2024, 16:00–16:15, EW 202

Transport in core/shell GaAs/InAs/Al half-shell nanowire-based hybrid devices — •Farah Basarić1,2, Patrick Zellekens3, Russell Deacon3, Vladan Brajović1,2, Alexander Pawlis1,2, Gerrit Behner1,2, Hans Lüth1,2, Detlev Grützmacher1,2, Koji Ishibashi3, 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 — 3RIKEN Center for Emergent Matter Science and Advanced Device Laboratory, 351-0198 Saitama, Japan

Epitaxially grown core-shell GaAs/InAs nanowires provide a heterostructure with transport properties governed by the angular momentum states in the InAs shell. Besides conventional polymorphic GaAs/InAs nanowires, phase-pure core/shell nanowires featuring only wurtzite crystal structure along the axis were studied by magnetotransport measurements under an axial magnetic field. Transport regime analysis for both nanowire types indicates the presence of Aharonov-Bohm-type oscillations, while magnetotransport analysis suggests a strong effect of disorder reduction for phase-pure nanowires. This is manifested by the presence of the quasi-ballistic transport regime, indicating superior transport properties of the phase-pure nanowire. Combining phase-pure GaAs/InAs nanowires with an in-situ deposited superconducting Al half-shell, a gate-controlled Josephson junction was fabricated.

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