Imaging electron density in a two-dimensional electron gas

B. J. LeRoy, M. A. Topinka, R. M. Westervelt, K. D. Maranowski, A. C. Gossard

Research output: Contribution to journalArticle

24 Scopus citations

Abstract

Spatial profiles of the electron density in a two-dimensional electron gas were obtained from the spacing of interference fringes in coherent electron flow. Images of electron flow from a quantum point contact formed in a GaAs/AlGaAs heterostructure were recorded with a liquid He cooled scanned probe microscope. The images are decorated with interference fringes spaced by half the Fermi wavelength; the fringe spacing measures the electron density below the scanned probe microscope tip. As the density is decreased with a back gate, the fringe spacing increases in agreement with a planar capacitor model.

Original languageEnglish (US)
Pages (from-to)4431-4433
Number of pages3
JournalApplied Physics Letters
Volume80
Issue number23
DOIs
StatePublished - Jun 10 2002
Externally publishedYes

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ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

LeRoy, B. J., Topinka, M. A., Westervelt, R. M., Maranowski, K. D., & Gossard, A. C. (2002). Imaging electron density in a two-dimensional electron gas. Applied Physics Letters, 80(23), 4431-4433. https://doi.org/10.1063/1.1484548