TY  - JOUR
AU  - Heedt, S.
AU  - Prost, W.
AU  - Schubert, J.
AU  - Grützmacher, D.
AU  - Schäpers, Th.
TI  - Ballistic Transport and Exchange Interaction in InAs Nanowire Quantum Point Contacts
JO  - Nano letters
VL  - 16
IS  - 5
SN  - 1530-6992
CY  - Washington, DC
PB  - ACS Publ.
M1  - FZJ-2016-02531
SP  - 3116 - 3123
PY  - 2016
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000375889700033
DO  - DOI:10.1021/acs.nanolett.6b00414
UR  - https://juser.fz-juelich.de/record/809307
ER  -