Conference Presentation (Invited)

FZJ-2015-01943

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Quantum Transport in Core/Shell Semiconductor Nanowires

Schäpers, T. (Corresponding Author)FZJ* ; Haas, F.FZJ* ; Zellekens, P.FZJ* ; Rieger, T.FZJ* ; Wenz, T.FZJ* ; Günel ; Gül ; Demarina, N.FZJ* ; Lepsa, M. I.FZJ* ; Lüth, H.FZJ* ; Grützmacher, D.FZJ*

2015

Abstract: The transport properties of GaAs/InAs core/shell nanowires is investigated, where the highly conductive InAs shell is wrapped around an insulating GaAs core nanowire. At low temperatures pronounced flxperiodic (h/e) magnetoconductance oscillations are observed, when the magnetic fild is oriented along the nanowire axis. These very regular oscillations are explained by the formation of closed-loop quantumstates in the tube-like InAs shell comprising a flx periodic energy spectrum. The magnetoconductance oscillations are even observed at temperatures as high as 50K. When the GaAs/InAs core/shell nanowire is contacted by two superconducting Nb electrodes the carrier transport is governed by phase-coherent Andreev reflction processes. Here, the observed oscillation period in the magneto-transport corresponds to half a flx quantum (h/2e).

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Contributing Institute(s):

1. Halbleiter-Nanoelektronik (PGI-9)

Research Program(s):

1. 521 - Controlling Electron Charge-Based Phenomena (POF3-521) (POF3-521)

Appears in the scientific report 2015

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