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.
Original language | English (US) |
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Article number | 136804 |
Journal | Physical review letters |
Volume | 95 |
Issue number | 13 |
DOIs | |
State | Published - Sep 23 2005 |
Externally published | Yes |
All Science Journal Classification (ASJC) codes
- General Physics and Astronomy