Berlin 2018 – scientific programme
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MA: Fachverband Magnetismus
MA 36: Topological insulators and Weyl semimetals (joint session MA/TT)
MA 36.4: Talk
Wednesday, March 14, 2018, 15:45–16:00, EB 407
Edelstein effect in Weyl semimetals — •Annika Johansson1,2, Jürgen Henk2, and Ingrid Mertig2,1 — 1Max Planck Institute of Microstructure Physics, Halle, Germany — 2Martin Luther University Halle-Wittenberg, Halle, Germany
Using semiclassical Boltzmann transport theory, we predict a current-induced spin polarization in Weyl semimetals, similar to the Edelstein effect of surface states in Rashba systems or in topological insulators [1]. The theory is applied to the Weyl semimetal TaAs simulated by an effective two-band model [2,3], for which we estimate the magnitude of the effect. The main contribution comes from the topological surface states, i. e. the Fermi arcs, which provide an enormous current-induced spin polarization.
[1] V. M. Edelstein, Solid State Commun., 73, 233 (1990) [2] S. Murakami and S.-i. Kuga, Phys. Rev. B 78, 165313 (2008) [3] R. Okugawa and S. Murakami, Phys. Rev. B 89, 235315 (2014)