Imaging transport resonances in the quantum Hall effect |
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Authors: | Steele G A Ashoori R C Pfeiffer L N West K W |
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Institution: | Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA. |
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Abstract: | 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. |
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