Berlin 2018 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 28: Poster Session: Topological Topics

TT 28.9: Poster

Montag, 12. März 2018, 15:00–19:00, Poster B

Electrical transport studies on the type-II Weyl semimetal candidate W_1−xMo_xTe₂ — •Matthias Gillig^1,2, Federico Caglieris¹, Boy Roman Piening¹, Igor Morozov^1,4, Saicharan Aswartham¹, Joseph Dufouleur¹, Bernd Büchner^1,2,3, and Christian Hess^1,2,3 — ¹Leibniz-Institute for Solid State and Materials Research, IFW Dresden, 01069 Dresden, Germany — ²Institute of Solid State Physics, TU Dresden, 01069 Dresden, Germany — ³Center for Transport and Devices of Emergent Materials, TU Dresden, 01069 Dresden, Germany — ⁴Moscow State University, 119991 Moscow, Russia

The semimetals WTe₂ and Td-MoTe₂ have been the first compounds proposed as a type-II Weyl semimetals. While for these parent compounds the Weyl points are far above the Fermi level, it is presumed that mixing the two phases brings them to relevant energies.

We have performed magneto-electrical transport measurements on a series of W_1−xMo_xTe₂ single crystals. Zero-field resistivity increases upon substituting Mo for W but keeps metallic properties. The large non-saturating magnetoresistance is reduced in between the two phases, while the Hall resistivity decreases continuously from WTe₂ to MoTe₂. A simple two-band analysis ascribes this behavior to suppressed charge carrier compensation and declining mobilities. Observed Shubnikov-de-Haas oscillations show no drastic changes of the electronic structure.