Double-Dot Quantum Ratchet Driven by an Independently Biased Quantum Point Contact

V. S. Khrapai, S. Ludwig, J. P. Kotthaus, H. P. Tranitz, and W. Wegscheider
Phys. Rev. Lett. 97, 176803 – Published 26 October 2006

Abstract

We study a double quantum dot (DQD) coupled to a strongly biased quantum point contact (QPC), each embedded in independent electric circuits. For weak interdot tunneling we observe a finite current flowing through the Coulomb blockaded DQD in response to a strong bias on the QPC. The direction of the current through the DQD is determined by the relative detuning of the energy levels of the two quantum dots. The results are interpreted in terms of a quantum ratchet phenomenon in a DQD energized by a nearby QPC.

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  • Received 14 June 2006

DOI:https://doi.org/10.1103/PhysRevLett.97.176803

©2006 American Physical Society

Authors & Affiliations

V. S. Khrapai1,2, S. Ludwig1, J. P. Kotthaus1, H. P. Tranitz3, and W. Wegscheider3

  • 1Center for NanoScience and Department für Physik, Ludwig-Maximilians-Universität, Geschwister-Scholl-Platz 1, D-80539 München, Germany
  • 2Institute of Solid State Physics RAS, Chernogolovka, 142432, Russian Federation
  • 3Institut für Experimentelle und Angewandte Physik, Universität Regensburg, D-93040 Regensburg, Germany

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Issue

Vol. 97, Iss. 17 — 27 October 2006

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