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 - Jan 22 2008

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Fingerprint Dive into the research topics of 'Linear and nonlinear conductance of ballistic quantum wires with hybrid confinement'. Together they form a unique fingerprint.

  • 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