Topographic Mapping of the Quantum Hall Liquid using a Few-Electron Bubble

Details Topographic Mapping of the Quantum Hall Liquid using a Few-Electron Bubble Topographic Mapping of the Quantum Hall Liquid using a Few-Electron Bubble

2000-07-18

arxiv.org/abs/cond-mat/0007291v1

Science, vol.289, p.90, 2000

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 JPG figures, Revtex. For additional info and AVI movies, visit http://electron.mit.edu/stm

Scientific paper

10.1126/science.289.5476.90

A scanning probe technique was used to obtain a high-resolution map of the random electrostatic potential inside the quantum Hall liquid. A sharp metal tip, scanned above a semiconductor surface, sensed charges in an embedded two-dimensional electron gas. Under quantum Hall effect conditions, applying a positive voltage to the tip locally enhanced the 2D electron density and created a ``bubble'' of electrons in an otherwise unoccupied Landau level. As the tip scanned along the sample surface, the bubble followed underneath. The tip sensed the motions of single electrons entering or leaving the bubble in response to changes in the local 2D electrostatic potential.

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