Direct determination of mode-projected electron-phonon coupling in the time 
domain

Na, M. X.; Mills, A. K.; Boschini, F.; Michiardi, M.; Nosarzewski, B.; Day, R. P.; Razzoli, E.; Sheyerman, A.; Schneider, M.; Levy, G.; Zhdanovich, S.; Devereaux, T. P.; Kemper, A. F.; Jones, D. J.; Damascelli, A.

doi:10.1126/science.aaw1662

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Direct determination of mode-projected electron-phonon coupling in the time domain

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Michiardi, M.
Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Na, M. X., Mills, A. K., Boschini, F., Michiardi, M., Nosarzewski, B., Day, R. P., et al. (2019). Direct determination of mode-projected electron-phonon coupling in the time domain. Science, 366, 1231-1236. doi:10.1126/science.aaw1662.

Cite as: https://hdl.handle.net/21.11116/0000-0005-6919-A

Abstract

Ultrafast spectroscopies have become an important tool for elucidating the microscopic description and dynamical properties of quantum materials. In particular, by tracking the dynamics of nonthermal electrons, a material's dominant scattering processes can be revealed. Here, we present a method for extracting the electron-phonon coupling strength in the time domain, using timeand angle-resolved photoemission spectroscopy (TR-ARPES). This method is demonstrated in graphite, where we investigate the dynamics of photoinjected electrons at the K point, detecting quantized energy-loss processes that correspond to the emission of strongly coupled optical phonons. We show that the observed characteristic time scale for spectral weight transfer mediated by phonon-scattering processes allows for the direct quantitative extraction of electron-phonon matrix elements for specific modes. Copyright © 2019 The Authors.