Regensburg 2019 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 43: Poster Tuesday: Electronic Structure
O 43.1: Poster
Dienstag, 2. April 2019, 18:00–20:00, Poster D
Studying the type-II Weyl semimetal candidate Td-WTe2 with two-photon photoemission — •Petra Hein1, Stephan Jauernik1, Yulin Chen2, Lexian Yang2, Binghai Yan3, Claudia Felser3, and Michael Bauer1 — 1Institute 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
Laser-based angle-resolved photoemission spectroscopy (ARPES) and two-photon photoemission (2PPE) are combined to investigate the near-EF electronic structure of the type-II Weyl semimetal candidate WTe2.
Using a widely tunable femtosecond laser system, we are able to access a variety of both occupied and unoccupied electronic states. Initial, intermediate and final states can be clearly distinguished via their characteristic peak shift in dependence of the photon energy. Photon-energy scans in conventional ARPES studies of three-dimensional systems are typically used to determine the kz dispersion of the occupied band structure. Here we show that in an analogous manner 2PPE is capable of probing the kz dispersion of unoccupied bands between EF and the vacuum level. The results are compared to different band structure calculations and current ARPES studies of WTe2.