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 journalArticlepeer-review

25 Scopus citations


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
Issue number23
StatePublished - Jun 10 2002

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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