Coherent Quantum Ratchets Driven by Tunnel Oscillations

Details Coherent Quantum Ratchets Driven by Tunnel Oscillations Coherent Quantum Ratchets Driven by Tunnel Oscillations

2009-12-18

arxiv.org/abs/0912.3713v1

Europhys. Lett. 91, 20007 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures

Scientific paper

10.1209/0295-5075/91/20007

We demonstrate that the tunnel oscillations of a biased double quantum dot can be employed as driving source for a quantum ratchet. As a model, we use two capacitively coupled double quantum dots. One double dot is voltage biased and provides the ac force, while the other experiences the ac force and acts as coherent quantum ratchet. The current is obtained from a Bloch-Redfield master equation which ensures a proper equilibrium limit. We find that the two-electron states of the coupled ratchet-drive Hamiltonian lead to unexpected steps in the ratchet current.

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