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

DOI to cite this document:
Khrapai, V. S. ; Ludwig, S. ; Kotthaus, Jörg P. ; Tranitz, Hans-Peter ; Wegscheider, Werner
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Date of publication of this fulltext: 25 Jan 2010 13:29


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 ...


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