SKM 2021 – wissenschaftliches Programm

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 13: Topological Insulators and Semimetals (joint session TT/KFM)

KFM 13.7: Vortrag

Freitag, 1. Oktober 2021, 11:45–12:00, H7

Impact of domain disorder on optoelectronic properties of semimetal MoTe₂ — •Maanwinder Partap Singh^1,2, Jonas Kiemle^1,2, Philipp Zimmermann^1,2, Marko Burghard³, Christoph Kastl^1,2, and Alexander Holleitner^1,2 — 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 (T_d), 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)