Dresden 2017 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 33: Transport: Topological Semimetals 2 (jointly with MA/TT)

DS 33.10: Vortrag

Mittwoch, 22. März 2017, 17:30–17:45, HSZ 204

Photoemission Spectrscopy of Type-II Weyl Semimetal Candidate MoTe2 — •Andrew Patton Weber1,2, Nan Xu1,2, Stefan Muff1,2, Mauro Fanciulli1,2, Arnaud Magrez1, Phillipe Bugnon1, Helmuth Berger1, BQ Lv3, Bin Bin Fu2,3, Christian Matt2, Joel Mesot1,2,4, Hong Ding3, Ming Shi2, and Jan Hugo Dil1,21Institute of Physics, École Polytechnique Fédérale de Lausanne, Lausanne, Switzerland — 2Swiss Light Source, Paul Scherrer Institute, Villigen-PSI, Switzerland — 3Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, China — 4Laboratory for Solid State Physics, ETH Zurich, Zurich, Switzerland

Topological matter can often be identified by signatures presented by the surface electron-structure. Type-II Weyl semimetal candidates, in which surface Fermi arcs can overlap with the projection of bulk Fermi pockets, have proven to be more difficult to characterize by these means, leading to controversies. The present work clarifies the situation for the case of the octahedral polytype of MoTe2 through temperature-dependent spin- and angle-resolved spectroscopy experiments. It is found that the appearance of large spin-polarized Fermi arcs (extending over more than 12% of a reciprocal lattice vector and exhibiting nearly full spin-polarization), occurs as a consequence of the transition from the inversion-symmetric 1T' structure to the inversion-symmetry-breaking Td structure. Moreover, helical spin-textures are found to be absent near the large Fermi arcs. These results indicate a topological origin for Fermi arc-like states.

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