A double-dot quantum ratchet driven by an independently biased quantum point contact

Details A double-dot quantum ratchet driven by an independently biased quantum point contact A double-dot quantum ratchet driven by an independently biased quantum point contact

2006-06-14

arxiv.org/abs/cond-mat/0606377v2

Phys. Rev. Lett. 97 176803 (2006)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

revised version

Scientific paper

10.1103/PhysRevLett.97.176803

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 tunnelling we observe a finite current flowing through the unbiased 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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