Dresden 2020 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 27: Topological Semimetals 2
TT 27.3: Talk
Tuesday, March 17, 2020, 14:30–14:45, HSZ 103
Disorder-induced coupling of Weyl nodes in WTe2 — •Steffen Sykora1, Johannes Schoop1, Bernd Büchner1,2,3, Christian Hess1,3, Romain Giraud1,4, and Joseph Dufouleur1,3 — 1IFW Dresden, 01069 Dresden, Germany — 2Institute for Solid State Physics, TU Dresden, 01069 Dresden, Germany — 3Center for Transport and Devices, TU Dresden, 01069 Dresden, Germany — 4Universite Grenoble Alpes, CNRS, CEA, Grenoble-INP, INAC-Spintec, F-38000 Grenoble, France
We consider theoretically the finite coupling between Weyl nodes due to residual disorder. The results are compared with quantum transport measurements in a WTe2 nanoflake where the transport time (backscattering) is related to the quantum life time (elastic mean free path) giving evidence for the anisotropic scattering of quasiparticles. Scattering processes within the material specific band structure are evaluated using a renormalization method allowing us to infer a rather short correlation length (ξ ∼ 5 nm) of the disorder, in agreement with an analytical approach neglecting scattering between different pockets. Our finding indicates that, if intra-node scattering is dominating over inter-node scattering, the coupling between Weyl nodes is significant, a key issue for the observation of many topological properties.