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HL: Fachverband Halbleiterphysik
HL 15: Quantum Dots and Wires: Fabrication and Devices
HL 15.13: Talk
Monday, March 7, 2016, 18:30–18:45, H16
In-situ growth of semiconductor/superconductor core-shell nanowires — •Nicholas Güsken1,2, Torsten Rieger1,2, Thomas Schäpers1,2, Detlev Grützmacher1,2, and Mihail Ion Lepsa1,2 — 1Peter Grünberg Institute 9, Forschungszentrum Jülich, 52425 Jülich, Germany — 2Jülich Aachen Research Alliance for Fundamentals of Future Information Technology (JARA-FIT), Germany
Semiconductor/superconductor(SM/SC) nanowire (NW) hybrid structures are of main interest for future research as they enable to investigate a variety of quantum effects such as Andreev reflections and the proximity effect. Additionally, InAs/Nb as well as InAs/Al core-shell NWs, might pave the way for a breakthrough with regard to Majorana-fermion related research and quantum computing. For all of the experiments, a clean SM/SC interface and low SM resistivity is crucial, to circumvent unambiguous core results. In this sense, the best solution is to fabricate the SM-NW core and the SC shell in-situ. In this work, we show results of the in-situ growth and preliminary morphological and electrical characterization of InAs/Al and InAs/Nb hybrid NWs.
The InAs NWs were grown self-assisted on Si substrates, using molecular beam epitaxy. Expecting more efficient and uniform doping, Te doping was employed to tailor the electron concentration of the NWs. Electrical characterization was conducted after the NW growth to investigate the impact of Te doping on the NWs. Finally, Al or Nb, were deposited on the side facets of the NWs.
The quality of the SM/SC core-shell NWs was investigated by SEM and preliminary transport measurements at low temperatures.