Double-dot quantum ratchet driven by an independently biased quantum point contact.
Phys Rev Lett
; 97(17): 176803, 2006 Oct 27.
Article
in En
| MEDLINE
| ID: mdl-17155493
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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Collection:
01-internacional
Database:
MEDLINE
Main subject:
Quantum Dots
Language:
En
Journal:
Phys Rev Lett
Year:
2006
Document type:
Article