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Berlin 2024 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 36: Poster: Ultrafast Electron Dynamics at Surfaces and Interfaces

O 36.1: Poster

Dienstag, 19. März 2024, 18:00–20:00, Poster C

Differences in the electron dynamics of inequivalent (001) surfaces of Td-WTe2: top and bottom or topological trivial and topological non-trivial? — •Klaas Opitz1, Hauke Beyer1, Eduard Moos1, Kai Rossnagel1,2,3, and Michael Bauer1,21Institute of Experimental and Applied Physics, Kiel University, 24098 Kiel, Germany — 2Kiel Nano, Surface and Interface Science KiNSIS, Kiel University, 24118 Kiel, Germany — 3Deutsches Elektronen-Synchrotron DESY, Ruprecht Haensel Lab, 22607 Hamburg, Germany

ARPES spectra of [100]-oriented Td-WTe2 show clear differences, which in the past have been associated either with different topological phases [1] or alternatively interpreted as a signature for the small but finite structural differences of the (001) and (001) surface resulting from the broken inversion symmetry of the material [2]. In this contribution we will present time-resolved ARPES data of Td-WTe2 that clearly hint to distinct differences also in the electron dynamics for these two surfaces. We will discuss our results under consideration of the different interpretations of the ARPES data.

[1] Y. Wu et al., Phys. Rev. B. 94, 121113(R) (2016).

[2] Y. Wan et al., Phys. Rev. B. 105, 085421 (2022).

Keywords: ultrafast; TMDC; WTe2; Weyl-Semimetal; trARPES

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