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Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 62: Poster Wednesday: Topology and Symmetry-Protected Materials

O 62.4: Poster

Mittwoch, 3. April 2019, 17:45–20:00, Poster B1

Type-II Weyl semimetals – spin-polarization, impurity scattering, and a polar instability — •Philipp Rüßmann1, Phivos Mavropoulos1,2, and Stefan Blügel11Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, 52425 Jülich, Germany — 2Department of Physics, National and Kapodistrian University of Athens, 15784 Zografou, Greece

Weyl semimetals are a new class of materials that host topologically protected crossings in their bulk electronic structure. Their intriguing transport properties have the potential to spark the development of radically new technologies based on topological semimetals. However, to fully realise their potential in the future, a microscopic understanding of the topological phase is required in terms of their nature of the phase transition and the functional response to impurities. In recent joint studies [1,2] we investigated the type-II Weyl semimetal candidates MoTe2 and WTe2 by combining DFT calculations with STM and ARPES experiments. Here, focusing on the theoretical side, we discuss evidence of a polar instability near the structural phase transition from the topologically trivial to the non-trivial Weyl phase in MoTe2 [1]. In studying the response of both surface and bulk states to perturbations in topologically trivial WTe2 and the stable Weyl phase in MoTe2, we are able to uncover the existence of a universal response of surface- and bulk-derived topologically protected quasiparticles to naturally occurring defects in the crystals [2].

[1] A. P. Weber, et al. PRL 121, 156401 (2018)

[2] P. Rüßmann, et al. PRB 97, 075106 (2018)

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