Berlin 2015 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 94: Spin-Dependent Transport Phenomena I (organized by MA)
TT 94.9: Talk
Thursday, March 19, 2015, 11:30–11:45, H 0112
Spin Hall effect in two-dimensional systems — •Annika Johansson1, Christian Herschbach1,2, Dmitry Fedorov2,1, and Ingrid Mertig1,2 — 1Martin Luther University Halle-Wittenberg, Halle, Germany — 2Max Planck Institute of Microstructure Physics, Halle, Germany
A relativistic phase shift model (RPSM), derived as a generalization of the resonant scattering model [1-4], was introduced recently [5] to describe the skew-scattering mechanism of the spin Hall effect (SHE) caused by impurities in bulk crystals. The RPSM was found to be an appropriate model to obtain a simple qualitative description of the SHE for dilute bulk alloys based on host crystals with free-electron like Fermi surfaces and weak spin-orbit coupling [6].
Here, we present its analogue for two-dimensional (2D) systems. The proposed 2D-RPSM provides good qualitative agreement with ab initio results obtained for dilute alloys based on one-monolayer noble metal films. However, the colossal SHE caused by Bi impurities [7] is not reproduced due to a strong influence of vertex corrections for these systems not properly taken into account by the model. The relation of the 2D-RPSM to the 2D resonant scattering model [8] is also discussed.
[1] A. Fert et al., J. Magn. Magn. Mater. 24, 231 (1981); [2] G.Y. Guo et al., PRL 102, 036401 (2009); [3] A. Fert and P.M. Levy, PRL 106, 157208 (2011); [4] P.M. Levy et al., PRB 88, 214432 (2013); [5] D.V. Fedorov et al., PRB 88, 085116 (2013); [6] A. Johansson et al., J. Phys.: Condens. Matter 26, 274207 (2014); [7] C. Herschbach et al., PRB 90, 180406(R) (2014); [8] B. Gu et al., arXiv:1402.3012.