Regensburg 2022 – scientific programme
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O: Fachverband Oberflächenphysik
O 9: Ultrafast Electron Dynamics at Surfaces and Interfaces 2
O 9.4: Talk
Monday, September 5, 2022, 15:45–16:00, H3
Coherent phonon-driven transient modulation of a Dresselhaus-type spin splitting in Td-WTe2 — Petra Hein1, Stephan Jauernik1, Hermann Erk1, Lexian Yang2,3, Yangpen Qi4,5, Yan Sun5, Claudia Felser5, and •Michael Bauer1 — 1Institute of Experimental and Applied Physics, University of Kiel, Germany — 2State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing, China — 3Frontier Science Center for Quantum Information, Beijing, China — 4School of Physical Science and Technology, ShanghaiTech University, China — 5Max Planck Institute for Chemical Physics of Solids, Dresden, Germany
Time- and angle-resolved photoemission spectroscopy is used to study transient changes of the electronic structure in the Weyl-semimetal Td-WTe2 in response to the excitation of coherent phonons. A Fourier-transform of the three-dimensional experimental data yields phonon-mode resolved insights into such coupling processes. Results of our analysis reveal a transient modulation of a Dresselhaus-type spin splitting of electronic bands that is selectively driven by the excitation of an interlayer shear mode of the layered compound [1]. The results provide real-time insights into electron-phonon coupled processes that are of vital importance for a light-driven topological phase transition in Td-WTe2.
[1] P. Hein, et al., Nat. Commun. 11, 2613 (2020).