Topographic mapping of the quantum hall liquid using a few-electron bubble

G. Finkelstein, P. I. Glicofridis, R. C. Ashoori, M. Shayegan

Research output: Contribution to journalArticlepeer-review

108 Scopus citations


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 twodimensional (2D) 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 revel 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.

Original languageEnglish (US)
Pages (from-to)90-94
Number of pages5
Issue number5476
StatePublished - Jul 7 2000

All Science Journal Classification (ASJC) codes

  • General


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