Dresden 2011 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 5: Innovative Systems and Devices
HL 5.3: Vortrag
Montag, 14. März 2011, 10:45–11:00, POT 06
Electronic Transport Properties of Nb/InAs-Nanowire/Nb Josephson Junctions — •h. yusuf günel1, igor e. batov2, hilde hardtdegen1, kamil sladek1, andreas penz1, gregor panaitov3, detlev grützmacher1, and thomas schäpers1 — 1Institute of Bio- and Nanosystems (IBN-1) and JARA-Fundamentals of Future Information Technology, Forschungszentrum Jülich, 52425 Jülich, Germany — 2Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Moscow district, Institutskaya 2, 142432 Russia — 3Institute of Bio- and Nanosystems (IBN-2) and JARA-Fundamentals of Future Information Technology, Forschungszentrum Jülich, 52425 Jülich, Germany
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 7K and a magnetic field of 0.5T, 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.