Dresden 2011 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 64: Quantum Wires: Transport
HL 64.1: Vortrag
Mittwoch, 16. März 2011, 16:30–16:45, POT 251
Electronic Transport Properties of Nb/InAs-Nanowire/Nb Josephson Junctions — Yusuf Günel1, Igor Batov2, •Hilde Hardtdegen1, Kamil Sladek1, Andreas Einden1, Gregor Panaitov3, Detlev Grützmacher1, and Thomas Schäpers1 — 1Instut für Halbleiter Nanoelektronik, Peter Grünberg Institut - 9 und Jülich Aachen Research Alliance on Fundamentals of Future Information Technology (JARA-FIT) Forschungszentrum Jülich, 52525 Jülich — 2Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Moscow district, Institutskaya 2, 142432 Russia — 3Institut für Bioelektronik, Peter grünberg Institut - 8 and JARA-Fundamentals of Future Information Technology, Forschungszentrum Jülich, 52425 Jülich
We experimentally studied the electronic transport properties of Nb/InAs-Nanowire/Nb Josephson junctions. Highly doped InAs nanowires were used as a weak link between two superconducting electrodes, in order to form a Josephson junction (JJs). At temperatures below the critical temperature of Nb (Tc~7K) a clear supercurrent was observed in the current *voltage characteristics. In addition, we analyzed the temperature and magnetic field dependence of the Josephson supercurrent. A complete suppression of the supercurrent was observed at a temperature of around 7 K and a magnetic field of 0.5 T, respectively. In detailed magnetic field dependent measurements clear oscillations were observed in the differential resistance. Furthermore, at zero magnetic field the differential resistance revealed characteristic features of multiple Andreev reflections.