Quantum dissipative Rashba spin ratchets

Details Quantum dissipative Rashba spin ratchets Quantum dissipative Rashba spin ratchets

2008-03-25

arxiv.org/abs/0803.3526v2

Physical Review Letters 100, 230601 (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 figures, physical explanation of the results was added, role of the spin torque is now mentioned, Fig. 2 was change

Scientific paper

10.1103/PhysRevLett.100.230601

We predict the possibility to generate a finite stationary spin current by applying an unbiased ac driving to a quasi-one-dimensional asymmetric periodic structure with Rashba spin-orbit interaction and strong dissipation. We show that under a finite coupling strength between the orbital degrees of freedom the electron dynamics at low temperatures exhibits a pure spin ratchet behavior, {\it i.e.} a finite spin current and the absence of charge transport in spatially asymmetric structures. It is also found that the equilibrium spin currents are not destroyed by the presence of strong dissipation.

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