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 (PRB) 81, 085303.
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We calculate the electrically induced spin accumulation in diffusive systems due to both Rashba (with strength and Dresselhaus (with strength 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, . In thermodynamically large systems, the finite spin accumulation predicted by Chaplik, Entin and Magarill, [Physica E , 744 (2002)] and by Trushin and Schliemann [Phys. Rev. B , 155323 (2007)] is recovered an infinitesimally small distance away from the singular point . 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 , (ii) in the presence of a cubic Dresselhaus interaction of strength , or (iii) for finite frequency measurements. We obtain the parametric range over which the magnetoelectric effect is suppressed in these three instances as (i) , (ii), and (iii) with the elastic mean free path and the Fermi momentum. We attribute the absence of spin accumulation close to to the underlying U (1) symmetry. We illustrate and confirm our predictions numerically.
|Date:||2 February 2010|
|Institutions:||Physics > Institute of Theroretical Physics > Chair Professor Richter > Group Klaus Richter|
|Projects:||SFB 689: Spinphänomene in reduzierten Dimensionen|
|Subjects:||500 Science > 530 Physics|
|Refereed:||Yes, this version has been refereed|
|Created at the University of Regensburg:||Partially|
|Deposited On:||30 Sep 2009 05:37|
|Last Modified:||05 Feb 2010 11:55|