Instabilities in quantum point contact structures

M. N. Wybourne, Jolinda C. Smith, C. Berven, R. Ramasubramaniam, S. M. Goodnick

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

We discuss the appearance of strong nonlinearities including S-type negative differential conductance in the I-V characteristics of quantum point contact (QPC) structures. Time-dependent measurements demonstrate that the highly nonlinear d.c. I-V features are associated with a temporal average of random telegraph switching (RTS) between different current levels. The RTS is only observed when the voltage across the device is such that the chemical potential on one side of the QPC is aligned with the bottom of a one-dimensional subband in the QPC. As the chemical potential is moved further into the subband, the switching behavior disappears until the next subband minimum is reached.

Original languageEnglish (US)
Pages (from-to)419-425
Number of pages7
JournalSuperlattices and Microstructures
Volume20
Issue number4
DOIs
StatePublished - 1996
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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