SKM 2021 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 27: Topological Insulators and Semimetals (joint session TT/KFM)
TT 27.7: Talk
Friday, October 1, 2021, 11:45–12:00, H7
Impact of domain disorder on optoelectronic properties of semimetal MoTe2 — •Maanwinder Partap Singh1,2, Jonas Kiemle1,2, Philipp Zimmermann1,2, Marko Burghard3, Christoph Kastl1,2, and Alexander Holleitner1,2 — 1Walter Schottky Institut and Physics Department, Technical University of Munich, Am Coulombwall 4a, 85748 Garching, Germany. — 2Munich Center of Quantum Science and Technology (MCQST), Schellingstr. 4, 80799 Munich, Germany. — 3Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany.
MoTe2, one of the candidates to realize the topological type-II Weyl semimetal, crystallizes in several structures. At room temperature, Mote2 can have either a semiconducting (2H) or a metallic phase (1T’). Upon cooling, the monoclinic phase undergoes a transition at ∼ 240 K into an orthorhombic phase (Td), which breaks the inversion symmetry. We investigate the optoelectronic properties of MoTe2 as a function of temperature using photocurrent spectroscopy in combination with Raman and transient reflection spectroscopy. We elucidate the impact of phase disorder on the generation of local photocurrents especially with respect to ultrafast photogalvanic currents [1].
[1] Singh et al. (submitted)(2021)