Phys. Rev. Lett. 95, 136804 (2005) [4 pages]Imaging Transport Resonances in the Quantum Hall EffectReceived 13 June 2005; published 23 September 2005 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. © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.95.136804
DOI:
10.1103/PhysRevLett.95.136804
PACS:
73.43.Fj, 73.23.Hk, 73.40.Gk
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