Regensburg 2025 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 23: Poster Ultrafast Electron Dynamics
O 23.3: Poster
Montag, 17. März 2025, 18:00–20:00, P2
Studying electron-phonon interaction in MoTe2 using time-resolved and frequency-domain ARPES — •Carl Eric Jensen1, Stephan Jauernik1, Petra Hein1, and Michael Bauer1,2 — 1Institute of Experimental and Applied Physics, Kiel University, 24098 Kiel, Germany — 2Kiel Nano, Surface and Interface Science KiNSIS, Kiel University, 24118 Kiel, Germany
The layered transition metal dichalcogenides MoTe2 and WTe2 attracted significant attention in the recent years due to the topological properties of their noncentrosymmetric Td-phase and their manipulation by coherent phonon excitation [1,2]. In this contribution we present time-resolved and frequency-domain ARPES (FD-ARPES) data of 1T’-MoTe2. Optical excitation of the electronic system by a near-infrared (1.5 eV) pump pulse results in the excitation of coherent phonons in this material. The frequencies of the observed coherent phonon modes agree with all-optical measurements of MoTe2 [2,3]. A Fouriertransform of the time-resolved ARPES data into the frequency-domain proviedes further insights into the interaction between electrons and phonons: The FD-ARPES data reveal the electronic band-selectivity of the indivitual coherent phonon modes. The results are compared with published work on WTe2 [4].
[1] Sie et al. Nature 565, 61-66 (2019)
[2] Zhang et al. Phys. Rev. X 9, 021036 (2019)
[3] Fukuda et al. Appl. Phys. Lett. 116, 093103 (2020)
[4] Hein et al. Nature Communications 11, 2613 (2020)
Keywords: Coherent Phonons; Electron-Phonon Interaction; time-resolved ARPES; Frequency-Domain ARPES