Imaging transport resonances in the quantum hall effect

G. A. Steele, R. C. Ashoori, L. N. Pfeiffer, K. W. West

Research output: Contribution to journalArticlepeer-review

43 Scopus citations


We use a scanning capacitance probe to image transport in the quantum Hall system. Applying a dc bias voltage to the tip induces a ring-shaped incompressible strip (IS) in the 2D electron system (2DES) that moves with the tip. At certain tip positions, short-range disorder in the 2DES creates a quantum dot island in the IS. These islands enable resonant tunneling across the IS, enhancing its conductance by more than 4 orders of magnitude. The images provide a quantitative measure of disorder and suggest resonant tunneling as the primary mechanism for transport across ISs.

Original languageEnglish (US)
Article number136804
JournalPhysical review letters
Issue number13
StatePublished - Sep 23 2005
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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