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No Access Submitted: 17 September 2007 Accepted: 09 November 2007 Published Online: 07 January 2008

  • Linear and nonlinear conductance of ballistic quantum wires with hybrid confinement

Journal of Applied Physics 103, 013701 (2008); https://doi.org/10.1063/1.2827466
H. Kothari, A. Ramamoorthy, R. Akis, S. M. Goodnick, and D. K. Ferry
  • Arizona Institute of Nanoelectronics, Arizona State University, Tempe, Arizona 85287-5706, USA
    • J. L. Reno
  • Center for Integrated Nanotechnologies, Sandia National Laboratories, P.O. Box 5800, Albuquerque, New Mexico 87185-1303, USA
    • J. P. Birda)
  • Department of Electrical Engineering, University at Buffalo, Buffalo, New York 14216, USA
    • more...View Affiliations
    View Contributors
    • H. Kothari
    • A. Ramamoorthy
    • R. Akis
    • S. M. Goodnick
    • D. K. Ferry
    • J. L. Reno
    • J. P. Bird
  • Correction: Journal of Applied Physics 103, 099901 (2008)
    • ABSTRACT
    We characterize the linear and nonlinear electron transport in quantum point contacts (QPCs) realized by a hybrid combination of etching and gating. We demonstrate that the strong electron confinement generated through this hybrid QPC process results in quantized subbands with a large energy separation, leading to the observation of robust one-dimensional quantum-transport effects. Measurements of the nonlinear differential conductance reveal an unexpected bunching of curves at 0.20−0.25×2e2/h, rather than at the expected value of 0.5×2e2/h. Application of a simple analytical model indicates that this bunching is associated with the highly asymmetric manner in which the source-drain voltage is dropped across the QPC near pinch-off and under nonequilibrium conditions.

    ACKNOWLEDGMENTS

    Work at ASU was supported by the National Science Foundation (ECS-0224163) and that at UB by the Department of Energy (DE-FG02-04ER46180). This work was performed, in part, at the Center for Integrated Nanotechnologies, a U.S. DOE, Office of Basic Energy Sciences nanoscale science research center. Sandia National Laboratories is a multiprogram laboratory operated by Sandia Corporation, a Lockheed-Martin Co., for the U. S. Department of Energy under Contract No. DE-AC04-94AL85000.

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