Dresden 2017 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 46: Electronic Structure of Surfaces: Spectroscopy, Surface States

O 46.8: Poster

Dienstag, 21. März 2017, 18:30–20:30, P1A

Studying the type-II Weyl semimetal Td-WTe2 with two-photon photoemission — •Petra Hein1, Stephan Jauernik1, Yulin Chen2, Lexian Yang2, Binghai Yan3, Claudia Felser3, and Michael Bauer11Institute of Experimental and Applied Physics, University of Kiel, Germany — 2Physics Department, Tsinghua University, Beijing, China — 3Max Planck Institute for Chemical Physics of Solids, Dresden, Germany

With their first experimental observation in 2015, topological Weyl semimetals have attracted enormous attention: In these materials, the long sought-after Weyl fermions are realized as quasi-particle excitations in condensed matter [1]. Weyl semimetals feature an unusual electronic structure with touching points in the bulk band structure – the so-called Weyl points - that are connected by unique topological surface Fermi arcs. The key technique to gain access to these signatures is angle-resolved photoelectron spectroscopy (ARPES) [2,3].
Here, we present a combined photoemission and two-photon photoemission (2PPE) study of the type-II Weyl semimetal Td-WTe2. Using a widely tunable femtosecond laser system with photon energies between 1.3 eV and 5.0 eV, we are able to access a variety of both occupied and unoccupied electronic states. The results are discussed under consideration of band structure calculations and current ARPES studies of Td-WTe2.
A. Vishwanath, Physics 8, 84 (2015).
S.-Y. Xu et al., Science 349, 6248 (2015).
Y. Wu et al., Phys. Rev. B 94, 121113(R) (2016).

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