Scheid, Matthias and Bercioux, Dario and Richter, Klaus (2010) Spin-orbit based coherent spin ratchets. CHEMICAL PHYSICS, 375 (2-3). pp. 276-283. ISSN 0301-0104,
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The concept of ratchets, driven asymmetric periodic structures giving rise to directed particle flow, has recently been generalized to a quantum ratchet mechanism for spin currents mediated through spin-orbit interaction. Here we consider such systems in the coherent mesoscopic regime and generalize the proposal of a minimal spin ratchet model based on a non-interacting clean quantum wire with two transverse channels by including disorder and by self-consistently treating the charge redistribution in the nonlinear (adiabatic) ac-driving regime. Our Keldysh-Green function based quantum transport simulations show that the spin ratchet mechanism is robust and prevails for disordered, though non-diffusive, mesoscopic structures. Extending the two-channel to the multi-channel case does not increase the net ratchet spin current efficiency but, remarkably, yields a dc spin transmission increasing linearly with channel number. (C) 2010 Elsevier B. V. All rights reserved.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | MAGNETIC-FIELD; CONDUCTION ELECTRONS; ZEEMAN RATCHETS; POINT CONTACTS; QUANTUM-WELLS; SEMICONDUCTORS; TRANSPORT; POLARIZATION; SYMMETRY; DEVICES; Ratchets; Spin electronics; Mesoscopic quantum transport |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics > Chair Professor Richter > Group Klaus Richter |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 08 Jul 2020 08:45 |
| Last Modified: | 08 Jul 2020 08:45 |
| URI: | https://pred.uni-regensburg.de/id/eprint/24019 |
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