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 0.20-0.25×2 e2 /h, rather than at the expected value of 0.5×2 e2 /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.

Original languageEnglish (US)
Article number013701
JournalJournal of Applied Physics
Volume103
Issue number1
DOIs
StatePublished - 2008

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bunching
quantum wires
ballistics
nonequilibrium conditions
electrons
etching
electric potential
curves
energy

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)
  • Physics and Astronomy(all)

Cite this

Kothari, H., Ramamoorthy, A., Akis, R., Goodnick, S., Ferry, D. K., Reno, J. L., & Bird, J. P. (2008). Linear and nonlinear conductance of ballistic quantum wires with hybrid confinement. Journal of Applied Physics, 103(1), [013701]. https://doi.org/10.1063/1.2827466

Linear and nonlinear conductance of ballistic quantum wires with hybrid confinement. / Kothari, H.; Ramamoorthy, A.; Akis, R.; Goodnick, Stephen; Ferry, D. K.; Reno, J. L.; Bird, J. P.

In: Journal of Applied Physics, Vol. 103, No. 1, 013701, 2008.

Research output: Contribution to journalArticle

Kothari, H, Ramamoorthy, A, Akis, R, Goodnick, S, Ferry, DK, Reno, JL & Bird, JP 2008, 'Linear and nonlinear conductance of ballistic quantum wires with hybrid confinement', Journal of Applied Physics, vol. 103, no. 1, 013701. https://doi.org/10.1063/1.2827466
Kothari, H. ; Ramamoorthy, A. ; Akis, R. ; Goodnick, Stephen ; Ferry, D. K. ; Reno, J. L. ; Bird, J. P. / Linear and nonlinear conductance of ballistic quantum wires with hybrid confinement. In: Journal of Applied Physics. 2008 ; Vol. 103, No. 1.
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