Imaging Transport Resonances in the Quantum Hall Effect

Details Imaging Transport Resonances in the Quantum Hall Effect Imaging Transport Resonances in the Quantum Hall Effect

2005-06-15

arxiv.org/abs/cond-mat/0506347v2

Phys. Rev. Lett. 95, 136804 (2005)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures, submitted to PRL. For movies and additional infomation, see http://electron.mit.edu/scanning/; Added scale

Scientific paper

10.1103/PhysRevLett.95.136804

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 four orders of magnitude. The images provide a quantitative measure of disorder and suggest resonant tunneling as the primary mechanism for transport across ISs.

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