%ANa, M. [Department of Physics and Astronomy, University of British Columbia, Vancouver, BC V6T 1Z1, Canada., Quantum Matter Institute, Vancouver, BC V6T 1Z4, Canada.]%ANa, M.%AMills, A. [Department of Physics and Astronomy, University of British Columbia, Vancouver, BC V6T 1Z1, Canada., Quantum Matter Institute, Vancouver, BC V6T 1Z4, Canada.]%AMills, A.%ABoschini, F. [Department of Physics and Astronomy, University of British Columbia, Vancouver, BC V6T 1Z1, Canada., Quantum Matter Institute, Vancouver, BC V6T 1Z4, Canada.]%ABoschini, F.%AMichiardi, M. [Department of Physics and Astronomy, University of British Columbia, Vancouver, BC V6T 1Z1, Canada., Quantum Matter Institute, Vancouver, BC V6T 1Z4, Canada., Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany.]%AMichiardi, M.%ANosarzewski, B.%ANosarzewski, B. [Department of Materials Science and Engineering, Stanford Institute for Materials and Energy Sciences, Stanford, CA 94305, USA.]%ADay, R.%ADay, R. [Department of Physics and Astronomy, University of British Columbia, Vancouver, BC V6T 1Z1, Canada., Quantum Matter Institute, Vancouver, BC V6T 1Z4, Canada.]%ARazzoli, E. [Department of Physics and Astronomy, University of British Columbia, Vancouver, BC V6T 1Z1, Canada., Quantum Matter Institute, Vancouver, BC V6T 1Z4, Canada.]%ARazzoli, E.%ASheyerman, A. [Department of Physics and Astronomy, University of British Columbia, Vancouver, BC V6T 1Z1, Canada., Quantum Matter Institute, Vancouver, BC V6T 1Z4, Canada.]%ASheyerman, A.%ASchneider, M. [Department of Physics and Astronomy, University of British Columbia, Vancouver, BC V6T 1Z1, Canada., Quantum Matter Institute, Vancouver, BC V6T 1Z4, Canada.]%ASchneider, M.%ALevy, G.%ALevy, G. [Department of Physics and Astronomy, University of British Columbia, Vancouver, BC V6T 1Z1, Canada., Quantum Matter Institute, Vancouver, BC V6T 1Z4, Canada.]%AZhdanovich, S. [Department of Physics and Astronomy, University of British Columbia, Vancouver, BC V6T 1Z1, Canada., Quantum Matter Institute, Vancouver, BC V6T 1Z4, Canada.]%AZhdanovich, S.%ADevereaux, T.%ADevereaux, T. [Department of Materials Science and Engineering, Stanford Institute for Materials and Energy Sciences, Stanford, CA 94305, USA.]%AKemper, A.%AKemper, A. [Department of Physics, North Carolina State University, Raleigh, NC 27695, USA.]%AJones, D. [Department of Physics and Astronomy, University of British Columbia, Vancouver, BC V6T 1Z1, Canada., Quantum Matter Institute, Vancouver, BC V6T 1Z4, Canada.]%AJones, D.%ADamascelli, A.%ADamascelli, A. [Department of Physics and Astronomy, University of British Columbia, Vancouver, BC V6T 1Z1, Canada., Quantum Matter Institute, Vancouver, BC V6T 1Z4, Canada.]%BJournal Name: Science; Journal Volume: 366; Journal Issue: 6470; Related Information: CHORUS Timestamp: 2020-04-15 00:09:37 %D2019%IAmerican Association for the Advancement of Science (AAAS) %JJournal Name: Science; Journal Volume: 366; Journal Issue: 6470; Related Information: CHORUS Timestamp: 2020-04-15 00:09:37 %K %MOSTI ID: 10126474 %PMedium: X %TDirect determination of mode-projected electron-phonon coupling in the time domain %X

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 time- and angle-resolved photoemission spectroscopy (TR-ARPES). This method is demonstrated in graphite, where we investigate the dynamics of photoinjected electrons at theK¯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.

%0Journal Article