Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 7: Topological Semimetals I
TT 7.7: Vortrag
Montag, 12. März 2018, 11:00–11:15, A 053
Transport studies on the type-II Weyl semimetal candidate WTe2 — •Matthias Gillig1,2, Federico Caglieris1, Boy Roman Piening1, Igor Morozov1,4, Saicharan Aswartham1, Joseph Dufouleur1, Bernd Büchner1,2,3, and Christian Hess1,2,3 — 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 semimetal WTe2 has attracted attention due to its non-saturating extremely large magnetoresistance. Furthermore, it has been the first compound to be predicted as a type-II Weyl semimetal which supposedly gives rise to new topological characteristics.
We have performed a broad spectrum of transport studies on WTe2 single crystals. The peculiar magnetoresistance was reproduced while the Hall effect behaves normally. Likewise, the thermoelectric transport coefficients show no anomalous behavior. The thermopower is negative at high temperatures, changes sign at 50 K and develops a peak at 25 K. The Nernst signal is linear in field but shows a strong increase below 50 K. The thermal conductivity increases upon cooling with a phononic peak at 21 K. All results can explicitly be described by a simple two-band model where electron- and hole-like carriers are compensated and exhibit large mobilities.