Dresden 2020 – scientific programme

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MA: Fachverband Magnetismus

MA 16: INNOMAG e. V. Dissertation Prize

MA 16.4: Talk

Monday, March 16, 2020, 16:15–16:40, POT 6

Spin-orbit driven transport: Edelstein effect in Rashba systems and topological materials — •Annika Johansson — Institute of Physics, Martin Luther University Halle-Wittenberg, Halle, Germany

A charge current driven through a system with broken inversion symmetry can generate a spatially homogeneous spin polarization. This phenomenon is known as Edelstein effect [1,2]. Using semiclassical Boltzmann transport theory, I investigate the Edelstein effect in two- and three-dimensional Rashba systems and topological materials. Whereas the current-induced spin density in conventional isotropic Rashba systems is in-plane and perpendicular to the charge current, I show that the direction as well as the magnitude of the induced spin density can be strongly modified in systems with reduced symmetry, which provides new opportunities to control and manipulate the electrically induced magnetization [3].

Further, I predict a highly efficient Edelstein effect in three-dimensional Weyl semimetals, mainly originating from their topological surface states due to their favorable Fermi surface geometry, their strong spin polarization and the enhanced momentum relaxation time [4]. In comparison to Rashba systems, the Edelstein effect in Weyl semimetals is enhanced by at least one order of magnitude.

[1] A. Aronov and Y. Lyanda-Geller, JETP Lett. 50, 431 (1989).

[2] V. Edelstein, Solid State Commun. 73, 233 (1990).

[3] A. Johansson et al., Phys. Rev. B 93, 195440 (2016).

[4] A. Johansson et al., Phys. Rev. B 97, 085417 (2018).