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TT: Fachverband Tiefe Temperaturen
TT 84: 2D Materials: Electronic structure, excitations, etc. III (joint session O/HL/TT)
TT 84.11: Vortrag
Donnerstag, 12. März 2026, 17:30–17:45, HSZ/0204
Band-selective coherent phonon-driven band renormalization in 1T-MoTe2 — •Carl Jensen1, Christopher Emeis2, Stephan Jauernik1, Petra Hein1, Fabio Caruso2, and Michael Bauer1,3 — 1nstitute of Experimental and Applied Physics, Kiel University, 24098 Kiel, Germany — 2Institute of Theoretical Physics and Astrophysics, Kiel University, 24098 Kiel, Germany — 3Kiel Nano, Surface and Interface Science KiNSIS, Kiel University, 24118 Kiel, Germany
Understanding the coupling between coherent phonons and the electronic system is crucial for controlling nonequilibrium properties in solids. Here, we investigate mode- and band-selective electron-phonon coupling in centrosymmetric 1T-MoTe2 using time- and angle-resolved photoemission spectroscopy combined with frequency-domain analysis (FDARPES). Femtosecond near-infrared pulses excite coherent Ag-symmetric phonon modes at 2.34 THz, 3.34 THz, and 3.86 THz, which manifest as oscillatory modulations in photoemission intensity and binding energy across the valence bands. Pixel-wise Fourier analysis, based on a recently developed methodology [1], reveals pronounced band selectivity with distinct coupling strengths for different electronic states and phonon modes, enabling the evaluation of band-renormalization amplitudes in the few-meV range. Ab initio calculations using DFT/DFPT qualitatively reproduce the experimentally observed coupling patterns and relative trends, demonstrating the capability of combined experimental and theoretical approaches to resolve ultrafast electron-phonon interactions in quantum materials.
[1] N. Gauthier, H. Soifer, J.A. Sobota, H. Pfau, E. J. Sie, A. M. Lindenberg, Z.-X. Shen, P. S. Kirchmann, Rev. Sci. Instrum. 96 (2025)
Keywords: Coherent Phonons; Electron-Phonon Interaction; time-resolved ARPES