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Microscopic origin of the ‘0.7-anomaly’ in quantum point contacts

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  • Florian Bauer

    (Center for NanoScience and Fakultät für Physik, Ludwig-Maximilians-Universität München, Geschwister-Scholl-Platz 1, 80539 München, Germany
    Arnold Sommerfeld Center for Theoretical Physics, Ludwig-Maximilians-Universität München, Theresienstrasse 37, D-80333 München, Germany)

  • Jan Heyder

    (Center for NanoScience and Fakultät für Physik, Ludwig-Maximilians-Universität München, Geschwister-Scholl-Platz 1, 80539 München, Germany
    Arnold Sommerfeld Center for Theoretical Physics, Ludwig-Maximilians-Universität München, Theresienstrasse 37, D-80333 München, Germany)

  • Enrico Schubert

    (Center for NanoScience and Fakultät für Physik, Ludwig-Maximilians-Universität München, Geschwister-Scholl-Platz 1, 80539 München, Germany)

  • David Borowsky

    (Center for NanoScience and Fakultät für Physik, Ludwig-Maximilians-Universität München, Geschwister-Scholl-Platz 1, 80539 München, Germany)

  • Daniela Taubert

    (Center for NanoScience and Fakultät für Physik, Ludwig-Maximilians-Universität München, Geschwister-Scholl-Platz 1, 80539 München, Germany)

  • Benedikt Bruognolo

    (Center for NanoScience and Fakultät für Physik, Ludwig-Maximilians-Universität München, Geschwister-Scholl-Platz 1, 80539 München, Germany
    Arnold Sommerfeld Center for Theoretical Physics, Ludwig-Maximilians-Universität München, Theresienstrasse 37, D-80333 München, Germany)

  • Dieter Schuh

    (Institut für Angewandte Physik, Universität Regensburg, D-93040 Regensburg, Germany)

  • Werner Wegscheider

    (Laboratory for Solid State Physics, ETH Zürich, CH-8093 Zürich, Switzerland)

  • Jan von Delft

    (Center for NanoScience and Fakultät für Physik, Ludwig-Maximilians-Universität München, Geschwister-Scholl-Platz 1, 80539 München, Germany
    Arnold Sommerfeld Center for Theoretical Physics, Ludwig-Maximilians-Universität München, Theresienstrasse 37, D-80333 München, Germany)

  • Stefan Ludwig

    (Center for NanoScience and Fakultät für Physik, Ludwig-Maximilians-Universität München, Geschwister-Scholl-Platz 1, 80539 München, Germany)

Abstract

The ‘0.7-anomaly’ — an unexpected feature in the conductance of a quantum point contact — is shown to originate in a smeared van Hove singularity in the local density of states at the bottom of the lowest one-dimensional subband of the point contact.

Suggested Citation

  • Florian Bauer & Jan Heyder & Enrico Schubert & David Borowsky & Daniela Taubert & Benedikt Bruognolo & Dieter Schuh & Werner Wegscheider & Jan von Delft & Stefan Ludwig, 2013. "Microscopic origin of the ‘0.7-anomaly’ in quantum point contacts," Nature, Nature, vol. 501(7465), pages 73-78, September.
    • Handle: RePEc:nat:nature:v:501:y:2013:i:7465:d:10.1038_nature12421
    DOI: 10.1038/nature12421
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