Regensburg 2025 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 18: Poster Focus Session Ultrafast Electron Microscopy at the Space-Time Limit

O 18.2: Poster

Montag, 17. März 2025, 18:00–20:00, P2

Accessing energy- and momentum-dependent electron-phonon coupling from multidimensional photoemission data — •Hossein Yousofniadarzi, Julian Maklar, Martin Wolf, Ralph Ernstorfer, and Laurenz Rettig — Fritz Haber Institute of the Max Planck Society

Time- and angle-resolved photoemission spectroscopy (trARPES) provides a powerful method for probing ultrafast electron dynamics and their interactions with lattice vibrations. The electron-phonon (e-ph) interaction and its momentum dependence play an important role in many quantum materials, e.g., at the origin of charge-density-wave (CDW) formation. Here, we present an approach based on Fourier analysis, combined with a fitting procedure [1], that allows access to the energy and momentum dependence of the e-ph coupling strength for various coherent phonon modes in several CDW compounds. We discuss how these interactions vary across the Brillouin zone and contribute to the electronic structure modifications characteristic of the CDW phase. This work demonstrates the effectiveness of trARPES as a valuable technique for studying interactions in complex quantum materials.

[1] H. A. Hübener, et al., Phys. Rev. Lett. 125, 136401 (2020)

Keywords: Electron-Phonon; Coupling; trARPES; Fourier analysis; Momentum