Charge ratchet from spin flip: space-time symmetry paradox

Details Charge ratchet from spin flip: space-time symmetry paradox Charge ratchet from spin flip: space-time symmetry paradox

2009-11-17

arxiv.org/abs/0911.3273v1

Physical Review B, Rapid Communications, Vol. 80, No. 20, 201310(R) (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 3 figures

Scientific paper

10.1103/PhysRevB.80.201310

Traditionally the charge ratchet effect is considered as a consequence of either the spatial symmetry breaking engineered by asymmetric periodic potentials, or time asymmetry of the driving fields. Here we demonstrate that electrically and magnetically driven quantum dissipative systems with spin-orbit interactions represent an exception from this standard idea. In contrast to the so far well established belief, a charge ratchet effect appears when both the periodic potential and driving are symmetric. We show that the source of this paradoxical charge ratchet mechanism is the coexistence of quantum dissipation with the spin flip processes induced by spin-orbit interactions.

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