Dresden 2017 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 76: Poster Session: Transport 2

TT 76.18: Poster

Donnerstag, 23. März 2017, 15:00–19:00, P2-OG1

Scattering properties of electrons on TaAs Weyl Semimetal surfaces — •Steven Rendon Restrepo, Philipp Rüssmann, Phivos Mavropoulos, and Stefan Blügel — Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, D-52425 Jülich, Germany

In the field of topological materials, the recent discovery of the Type-I Weyl semi-metals TaAs, NbP, NbAs and TaP came as a breakthrough. (B.Q.Lv et al. Nat. Phys. 11, 724 (2015); S. Souma et al.,Phys. Rev. B 93, 161112(R) (2015); Su-Yang Xu et al. Nat Phys,11, 748 (2015); Xu et al. Sci. Adv. 2015;1:e1501092).

In this class of materials, the valence and conduction band in the bulk touch at generic points in the Brillouin zone (Weyl nodes) due to a nontrivial Berry curvature. The Weyl nodes, always appearing in pairs, show a linear band dispersion in all three k^→-directions. Their topological nature ultimately leads to topological surface states that take the form of open Fermi arcs.

In this presentation, I will discuss the band structure, spin-polarization and Fermi surfaces of the non-centrosymmetric TaAs family and present the relation of these properties to the scattering properties of electrons off surface defects. The calculations were performed using the density-functional-based, full-potential relativistic Korringa-Kohn-Rostoker Green-function method for electronic structure and impurity embedding.

Computational support from the JARA-HPC Centre at the RWTH Aachen University is acknowledged.