Quantized acoustoelectric current in the presence of large tunneling counterflow
- Nano-Science Center, Niels Bohr Institute fAFG, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen (Denmark)
- Department of Physics, Technical University of Denmark, DK-2800 Lyngby (Denmark)
A surface acoustic wave drives an electrical current through a short quantum wire. A second tunneling current is injected by biasing one side of the quantum wire. These two contributions to the total current, which flow in opposite directions, are controlled almost independently by the gate and the bias voltage, respectively. We have observed the quantization of the acoustoelectric current at up to ten times larger counterflowing tunneling currents. At large tunneling currents the acoustoelectric current can be strongly suppressed. However, this does not seem to be due to an electrostatic interaction between the two currents, but is probably caused by the complex potential landscape in the narrow channel of the quantum wire.
- OSTI ID:
- 20662283
- Journal Information:
- Physical Review. B, Condensed Matter and Materials Physics, Vol. 70, Issue 23; Other Information: DOI: 10.1103/PhysRevB.70.235345; (c) 2004 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- English
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