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  • Title: Ballistic Transport and Exchange Interaction in InAs Nanowire Quantum Point Contacts.
    Author: Heedt S, Prost W, Schubert J, Grützmacher D, Schäpers T.
    Journal: Nano Lett; 2016 May 11; 16(5):3116-23. PubMed ID: 27104768.
    Abstract:
    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-one-dimensional 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 0.7·2e(2)/h conductance anomaly, commonly found in planar devices.
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