Mono-parametric quantum charge pumping: Interplay between spatial interference and photon-assisted tunneling
Abstract
We analyze quantum charge pumping in an open ring with a dot embedded in one of its arms. We show that cyclic driving of the dot levels by a single parameter leads to a pumped current when a static magnetic flux is simultaneously applied to the ring. Based on the computation of the Floquet-Green’s functions, we show that for low driving frequencies ω0 , the interplay between the spatial interference through the ring plus photon-assisted tunneling gives an average direct current, which is proportional to ω20 . The direction of the pumped current can be reversed by changing the applied magnetic field.
- Publication:
-
Physical Review B
- Pub Date:
- December 2005
- DOI:
- 10.1103/PhysRevB.72.245339
- arXiv:
- arXiv:cond-mat/0511223
- Bibcode:
- 2005PhRvB..72x5339F
- Keywords:
-
- 73.23.-b;
- 72.10.-d;
- 73.40.Ei;
- 05.60.Gg;
- Electronic transport in mesoscopic systems;
- Theory of electronic transport;
- scattering mechanisms;
- Rectification;
- Quantum transport;
- Condensed Matter - Mesoscopic Systems and Quantum Hall Effect
- E-Print:
- 7 pages, 4 figures. To appear in Phys. Rev. B