Imaging coherent electron wave flow in a two-dimensional electron gas

Brian J Leroy, A. C. Bleszynski, M. A. Topinka, R. M. Westervelt, S. E J Shaw, E. J. Heller, K. D. Maranowski, A. C. Gossard

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

We measure the energy distribution of electrons passing through a two-dimensional electron gas using a scanning probe microscope (SPM). We present direct spatial images of coherent electron wave flow from a quantum point contact formed in a GaAs/AlGaAs two-dimensional electron gas using a liquid He cooled SPM. A negative voltage is placed on the tip, which creates a small region of depleted electrons that backscatters electron waves. Oscillating the voltage on the tip and locking into this frequency gives the spatial derivative of electron flow perpendicular to the direction of current flow. We show images of electron flow using this method. By measuring the amount of electrons backscattered as a function of the voltage applied to the tip, the energy distribution of electrons is measured.

Original languageEnglish (US)
Pages (from-to)163-164
Number of pages2
JournalPhysica E: Low-Dimensional Systems and Nanostructures
Volume18
Issue number1-3
DOIs
Publication statusPublished - May 2003
Externally publishedYes

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Keywords

  • Quantum point contact
  • Scanning probe microscopy
  • Two-dimensional electron gas

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Leroy, B. J., Bleszynski, A. C., Topinka, M. A., Westervelt, R. M., Shaw, S. E. J., Heller, E. J., ... Gossard, A. C. (2003). Imaging coherent electron wave flow in a two-dimensional electron gas. Physica E: Low-Dimensional Systems and Nanostructures, 18(1-3), 163-164. https://doi.org/10.1016/S1386-9477(02)01067-6