Volume 126, Number 5, June 2019
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||27 June 2019|
Ultrafast dynamics of electron-phonon coupling in a metal
1 Department of Physics, Pusan National University - Busan 46241, South Korea
2 Materials Sciences Division, Lawrence Berkeley National Laboratory - Berkeley, CA 94720, USA
3 School of Physics and Astronomy, Shanghai Jiao Tong University - Shanghai 200240, China
4 Department of Applied Physics, Tohoku University - Sendai 980-8579, Japan
5 Department of Engineering and Applied Sciences, Sophia University - Tokyo 102-8554, Japan
6 Department of Physics, University of California - Berkeley, CA 94720, USA
Received: 13 April 2019
Accepted: 17 June 2019
In the past decade, the advent of time-resolved spectroscopic tools has provided a new ground to explore fundamental interactions in solids and to disentangle degrees of freedom whose coupling leads to broad structures in the frequency domain. Time- and angle-resolved photoemission spectroscopy (tr-ARPES) has been utilized to directly study the relaxation dynamics of a metal in the presence of electron-phonon coupling. The effect of photo-excitations on the real and imaginary part of the self-energy as well as the time scale associated with different recombination processes are discussed. In contrast with a theoretical model, the phonon energy does not set a clear scale governing quasiparticle dynamics, which is also different from the results observed in a superconducting material. These results point to the need for a more complete theoretical framework to understand electron-phonon interaction in a photo-excited state.
PACS: 78.47.J- – Ultrafast spectroscopy (<1 psec) / 74.25.Jb – Electronic structure (photoemission, etc.) / 71.38.-k – Polarons and electron-phonon interactions
© EPLA, 2019
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