Quantized acoustoelectric current in the presence of large tunneling counterflow

K. Gloos, P. Utko, Jørn Bindslev Hansen, Poul Erik Lindelof

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Abstract

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.
Original languageEnglish
JournalPhysical Review B Condensed Matter
Volume70
Issue number23
Pages (from-to)235345
ISSN0163-1829
DOIs
Publication statusPublished - 2004

Bibliographical note

Copyright (2004) American Physical Society.

Keywords

  • CHANNEL
  • QUANTUM WIRES
  • FABRICATION
  • SINGLE-ELECTRON TRANSPORT
  • WAVES
  • ACOUSTIC CHARGE-TRANSPORT
  • PERPENDICULAR MAGNETIC-FIELD
  • POINT CONTACTS
  • GATE

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