Imaging coherent electron flow in a two-dimensional electron gas

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

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Images of coherent electron flow through a two-dimensional electron gas in a GaAs/AlGaAs heterostructure from a quantum point contact (QPC) were obtained at liquid He temperatures by using a scanning probe microscope with a charged tip that backscatters electrons. Near the QPC, at distances less than 500 nm, the images show angular lobes of electron flow in patterns determined by the quantum modes of the QPC. At greater distances, narrow branches of electron flow are observed, formed by the cumulative effects of small-angle scattering. In addition, the images show fringes spaced by half the Fermi wavelength, evidence that the electron flow is coherent. These observations agree well with theoretical simulations of electron flow.

Original languageEnglish (US)
Pages (from-to)138-140
Number of pages3
JournalPhysica E: Low-Dimensional Systems and Nanostructures
Volume18
Issue number1-3
DOIs
StatePublished - May 2003
Externally publishedYes

Fingerprint

Two dimensional electron gas
electron gas
Imaging techniques
Electrons
Point contacts
electrons
lobes
aluminum gallium arsenides
Heterojunctions
Microscopes
microscopes
Scattering
Scanning
Wavelength
scanning
probes
Liquids
liquids
scattering
wavelengths

Keywords

  • Image electron flow
  • Scanning probe microscopy
  • Two-dimensional electron gas

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Westervelt, R. M., Topinka, M. A., Leroy, B. J., Bleszynski, A. C., Shaw, S. E. J., Heller, E. J., ... Gossard, A. C. (2003). Imaging coherent electron flow in a two-dimensional electron gas. Physica E: Low-Dimensional Systems and Nanostructures, 18(1-3), 138-140. https://doi.org/10.1016/S1386-9477(02)01050-0

Imaging coherent electron flow in a two-dimensional electron gas. / Westervelt, R. M.; Topinka, M. A.; Leroy, Brian J; Bleszynski, A. C.; Shaw, S. E J; Heller, E. J.; Maranowski, K. D.; Gossard, A. C.

In: Physica E: Low-Dimensional Systems and Nanostructures, Vol. 18, No. 1-3, 05.2003, p. 138-140.

Research output: Contribution to journalArticle

Westervelt, RM, Topinka, MA, Leroy, BJ, Bleszynski, AC, Shaw, SEJ, Heller, EJ, Maranowski, KD & Gossard, AC 2003, 'Imaging coherent electron flow in a two-dimensional electron gas', Physica E: Low-Dimensional Systems and Nanostructures, vol. 18, no. 1-3, pp. 138-140. https://doi.org/10.1016/S1386-9477(02)01050-0
Westervelt, R. M. ; Topinka, M. A. ; Leroy, Brian J ; Bleszynski, A. C. ; Shaw, S. E J ; Heller, E. J. ; Maranowski, K. D. ; Gossard, A. C. / Imaging coherent electron flow in a two-dimensional electron gas. In: Physica E: Low-Dimensional Systems and Nanostructures. 2003 ; Vol. 18, No. 1-3. pp. 138-140.
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