Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 7: Topological Semimetals I
TT 7.8: Vortrag
Montag, 12. März 2018, 11:30–11:45, A 053
Spectacular electrical transport in type-II Weyl semimetals WP2 and MoP2 — •Nitesh Kumar1, Yan Sun1, Nan Xu2, Kaustuv Manna1, Vicky Suess1, Inge Leermakers3, Tobias Foerster4, Horst Borrmann1, Uli Zeitler3, Ming Shi2, Claudia Felser1, and Chandra Shekhar1 — 1Max Planck Institute for Chemical Physics of Solids, Dresden, Germany — 2Paul Scherrer Institute, Switzerland — 3High Field Magnet Laboratory, Nijmegen, Netherlands — 4Dresden High Magnetic Field Laboratory, Dresden, Germany
Semimetals are in general less conducting compared to metals due to smaller number of charge carriers. However, recent progress in the topological Dirac and Weyl semimetals show spectacular electronic properties such as large mobilities accompanied by extremely high magnetoresistance. In particular, two closely neighbouring Weyl points of the same chirality are protected from annihilation by structural distortions or defects. Here we present the electronic properties of type-II Weyl semimetals, WP2 and MoP2, with robust Weyl points by transport and angle resolved and first principles calculations. Single crystals of WP2 display an extremely low residual low-temperature resistivity of 3 nΩ cm accompanied by an enormous and highly anisotropic magnetoresistance above 200 million % at 63 T and 2.5 K [1]. A large suppression of charge carrier backscattering in WP2 from transport measurements suggests the involvement of the novel Weyl fermions expressed in this compound.
N. Kumar et al., Nature Commun. 8, (2017) 1642.