%0 Journal Article
%A Heedt, S.
%A Prost, W.
%A Schubert, J.
%A Grützmacher, D.
%A Schäpers, Th.
%T Ballistic Transport and Exchange Interaction in InAs Nanowire Quantum Point Contacts
%J Nano letters
%V 16
%N 5
%@ 1530-6992
%C Washington, DC
%I ACS Publ.
%M FZJ-2016-02531
%P 3116 - 3123
%D 2016
%X One-dimensional ballistic transport is demonstrated for a high-mobility InAs nanowire device. Unlike conventional quantum point contacts (QPCs) created in a two-dimensional electron gas, the nanowire QPCs represent one-dimensional constrictions formed inside a quasi-onedimensional conductor. For each QPC, the local subband occupation can be controlled individually between zero and up to six degenerate modes. At large out-of-plane magnetic fields Landau quantization and Zeeman splitting emerge and comprehensive voltage bias spectroscopy is performed. Confinement-induced quenching of the orbital motion gives rise to significantly modified subband-dependent Landé g factors. A pronounced g factor enhancement related to Coulomb exchange interaction is reported. Many-body effects of that kind also manifest in the observation of the 0.7·2e2/h conductance anomaly, commonly found in planar devices.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000375889700033
%R 10.1021/acs.nanolett.6b00414
%U https://juser.fz-juelich.de/record/809307