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MA: Fachverband Magnetismus

MA 14: INNOMAG e.V. Dissertationspreis 2019 / Ph.D. Thesis Prize

MA 14.1: Vortrag

Dienstag, 2. April 2019, 09:30–10:00, H48

Spin-charge coupled transport in two- and three-dimensional Rashba systems — •Sebastian Tölle — Institute of Physics, University of Augsburg, 86135 Augsburg, Germany

Recent progress in the theoretical description of two- and three-dimensional systems with Rashba spin-orbit coupling is described. Based on a Boltzmann-like quasiclassical approach, the transport equations are derived and applied to the following three - experimentally relevant - setups. First, a generalization of the spin-motive force due to a proximity induced magnetization in a quasi two-dimensional electron gas is derived, highlighting, in particular, a novel 'inverse-spin-filter' contribution as the result of a consistent treatment of spin-orbit contributions to the Elliott-Yafet collision operator [1]. Second, a two-dimensional Rashba system laterally attached to a ferromagnet is considered. In this setup, current-induced spin-polarizations significantly affect the boundary conditions at the interface, leading to a non-trivial asymmetric magnetization-dependence of the magnetoresistance [2]. In the third setup, the Rashba system is extended to the third dimension and placed on top of a ferromagnetic insulator. Several qualitative features of related experiments are reproduced. In particular, it is shown that the anisotropy of the spin relaxation, enhanced due to the mass anisotropy, plays a major role for the interpretation of the observed signals [3].

[1] S. Tölle et al., Phys. Rev. B 95, 115404 (2016).

[2] S. Tölle et al., Ann. Phys. (Berlin) 530, 1700303 (2018).

[3] S. Tölle et al., New J. Phys. 20, 103024 (2018).