Ballistic Transport and Exchange Interaction in InAs Nanowire Quantum Point Contacts

  • Heedt S
  • Prost W
  • Schubert J
 et al. 
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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 0.7·2e2/h conductance anomaly, commonly found in planar devices.

Author-supplied keywords

  • 0.7??2e2/h anomaly
  • Ballistic transport
  • InAs nanowire
  • exchange interaction
  • g factors
  • quantum point contacts

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Authors

  • S. Heedt

  • W. Prost

  • J. Schubert

  • D. Grützmacher

  • Th. Schäpers

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