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Zero-bias anomaly of quantum point contacts in the low-conductance limit

Y. Ren, W. W. Yu, S. M. Frolov, J. A. Folk, and W. Wegscheider
Phys. Rev. B 82, 045313 – Published 23 July 2010

Abstract

Most quantum point contacts (QPCs) fabricated in high-mobility two-dimensional electron gases show a zero-bias conductance peak near pinchoff but the origin of this peak remains a mystery. Previous experiments have primarily focused on the zero-bias peak at moderate conductance, in the range 12e2/h. Here, measurements are presented of zero-bias peaks that persist down to 104e2/h. Magnetic field and temperature dependencies of the zero-bias peak in the low-conductance limit are qualitatively different from the analogous phenomenology at higher conductance with implications for existing theoretical models of transport in low-density QPCs.

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  • Received 20 May 2010

DOI:https://doi.org/10.1103/PhysRevB.82.045313

©2010 American Physical Society

Authors & Affiliations

Y. Ren, W. W. Yu, S. M. Frolov*, and J. A. Folk

  • Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z1

W. Wegscheider

  • Laboratorium für Festkörperphysik, ETH Zürich, 8093 Zürich, Switzerland

  • *Present address: Kavli Institute of Nanoscience, Delft University of Technology, 2628 CJ Delft, The Netherlands.

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Issue

Vol. 82, Iss. 4 — 15 July 2010

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