Duckheim, Mathias and Loss, Daniel and Scheid, Matthias and Richter, Klaus and Adagideli, Inanc and Jacquod, Philippe (2010) Spin accumulation in diffusive conductors with Rashba and Dresselhaus spin-orbit interaction. PHYSICAL REVIEW B, 81 (8): 085303. ISSN 2469-9950, 2469-9969
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We calculate the electrically induced spin accumulation in diffusive systems due to both Rashba (with strength alpha) and Dresselhaus (with strength beta) spin-orbit interaction. Using a diffusion equation approach we find that magnetoelectric effects disappear and that there is thus no spin accumulation when both interactions have the same strength, alpha = +/- beta. In thermodynamically large systems, the finite spin accumulation predicted by Chaplik, Entin, and Magarill [Physica E 13, 744 (2002)] and by Trushin and Schliemann [Phys. Rev. B 75, 155323 (2007)] is recovered an infinitesimally small distance away from the singular point alpha = +/- beta. We show however that the singularity is broadened and that the suppression of spin accumulation becomes physically relevant (i) in finite-sized systems of size L, (ii) in the presence of a cubic Dresselhaus interaction of strength gamma, or (iii) for finite-frequency measurements. We obtain the parametric range over which the magnetoelectric effect is suppressed in these three instances as (i) vertical bar alpha vertical bar-vertical bar beta vertical bar <= 1/mL, (ii) vertical bar alpha vertical bar-vertical bar beta vertical bar less than or similar to gamma p(F)(2), and (iii) vertical bar alpha vertical bar-vertical bar beta vertical bar less than or similar to root omega/mp(F)l with l the elastic mean-free path and pF the Fermi momentum. We attribute the absence of spin accumulation close to alpha = +/-beta to the underlying U(1) symmetry. We illustrate and confirm our predictions numerically.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | ELECTRIC-CURRENT; MAGNETIC-FIELD; HALL; SYSTEMS; FLUCTUATIONS; ORIENTATION; CHARGE; SEMICONDUCTORS; POLARIZATION; RESONANCE; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics > Chair Professor Richter > Group Klaus Richter |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 10 Aug 2020 09:24 |
| Last Modified: | 10 Aug 2020 09:24 |
| URI: | https://pred.uni-regensburg.de/id/eprint/25263 |
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