Near-field spectroscopy of a gated electron gas: a direct evidence for electrons localization

Details Near-field spectroscopy of a gated electron gas: a direct evidence for electrons localization Near-field spectroscopy of a gated electron gas: a direct evidence for electrons localization

1998-07-08

arxiv.org/abs/cond-mat/9807116v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

10 pages, 5 figures, to be published in PRL

Scientific paper

10.1103/PhysRevLett.81.1666

The near-field photoluminescence of a gated two-dimensional electron gas is measured. We use the negatively charged exciton, formed by binding of an electron to a photo-excited electron-hole pair, as an indicator for the local presence of charge. Large spatial fluctuations in the luminescence intensity of the negatively charged exciton are observed. These fluctuations are shown to be due to electrons localized in the random potential of the remote ionized donors. We use these fluctuations to image the electrons and donors distribution in the plane.

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