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

Florian Bauer, Jan Heyder, Enrico Schubert, David Borowsky, Daniela Taubert, Benedikt Bruognolo, Dieter Schuh, Werner Wegscheider, Jan von Delft () and Stefan Ludwig ()
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Florian Bauer: Center for NanoScience and Fakultät für Physik, Ludwig-Maximilians-Universität München, Geschwister-Scholl-Platz 1, 80539 München, Germany
Jan Heyder: Center for NanoScience and Fakultät für Physik, Ludwig-Maximilians-Universität München, Geschwister-Scholl-Platz 1, 80539 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
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
Stefan Ludwig: Center for NanoScience and Fakultät für Physik, Ludwig-Maximilians-Universität München, Geschwister-Scholl-Platz 1, 80539 München, Germany

Nature, 2013, vol. 501, issue 7465, 73-78

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.

Date: 2013
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DOI: 10.1038/nature12421

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