Ganichev, Sergey D. and Ivchenko, E. L. and Bel'kov, V. V. and Tarasenko, S. A. and Sollinger, M. and Weiss, D. and Wegscheider, Werner and Prettl, W. (2002) Spin-galvanic effect. NATURE, 417 (6885). pp. 153-156. ISSN 0028-0836
Full text not available from this repository.Abstract
There is much recent interest in exploiting the spin of conduction electrons in semiconductor heterostructures together with their charge to realize new device concepts(1). Electrical currents are usually generated by electric or magnetic fields, or by gradients of, for example, carrier concentration or temperature. The electron spin in a spin-polarized electron gas can, in principle, also drive an electrical current, even at room temperature, if some general symmetry requirements are met. Here we demonstrate such a 'spin-galvanic' effect in semiconductor heterostructures, induced by a non-equilibrium, but uniform population of electron spins. The microscopic origin for this effect is that the two electronic sub-bands for spin-up and spin-down electrons are shifted in momentum space and, although the electron distribution in each sub-band is symmetric, there is an inherent asymmetry in the spin-flip scattering events between the two sub-bands. The resulting current flow has been detected by applying a magnetic field to rotate an optically oriented non-equilibrium spin polarization in the direction of the sample plane. In contrast to previous experiments, where spin-polarized currents were driven by electric fields in semiconductor(2,3),we have here the complementary situation where electron spins drive a current without the need of an external electric field.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | QUANTUM-WELLS; ELECTRON-GAS; SEMICONDUCTORS; RELAXATION; INJECTION; GAAS; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Professor Ganichev > Group Sergey Ganichev Physics > Institute of Experimental and Applied Physics > Alumni or Retired Professors > Group Werner Wegscheider |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 26 Oct 2021 09:45 |
| Last Modified: | 26 Oct 2021 09:45 |
| URI: | https://pred.uni-regensburg.de/id/eprint/40266 |
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