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Mechanisms of electron-phonon coupling unraveled in momentum and time: The case of soft phonons in TiSe(2)

The complex coupling between charge carriers and phonons is responsible for diverse phenomena in condensed matter. We apply ultrafast electron diffuse scattering to unravel electron-phonon coupling phenomena in 1T-TiSe(2) in both momentum and time. We are able to distinguish effects due to the real...

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Autores principales: Otto, Martin R., Pöhls, Jan-Hendrik, René de Cotret, Laurent P., Stern, Mark J., Sutton, Mark, Siwick, Bradley J.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Association for the Advancement of Science 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8115930/
https://www.ncbi.nlm.nih.gov/pubmed/33980488
http://dx.doi.org/10.1126/sciadv.abf2810
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author Otto, Martin R.
Pöhls, Jan-Hendrik
René de Cotret, Laurent P.
Stern, Mark J.
Sutton, Mark
Siwick, Bradley J.
author_facet Otto, Martin R.
Pöhls, Jan-Hendrik
René de Cotret, Laurent P.
Stern, Mark J.
Sutton, Mark
Siwick, Bradley J.
author_sort Otto, Martin R.
collection PubMed
description The complex coupling between charge carriers and phonons is responsible for diverse phenomena in condensed matter. We apply ultrafast electron diffuse scattering to unravel electron-phonon coupling phenomena in 1T-TiSe(2) in both momentum and time. We are able to distinguish effects due to the real part of the many-body bare electronic susceptibility, [Formula: see text] , from those due to the electron-phonon coupling vertex, g(q), by following the response of semimetallic (normal-phase) 1T-TiSe(2) to the selective photo-doping of carriers into the electron pocket at the Fermi level. Quasi-impulsive and wave vector–specific renormalization of soft zone-boundary phonon frequencies (stiffening) is observed, followed by wave vector–independent electron-phonon equilibration. These results unravel the underlying mechanisms driving the phonon softening that is associated with the charge density wave transition at lower temperatures.
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spelling pubmed-81159302021-05-19 Mechanisms of electron-phonon coupling unraveled in momentum and time: The case of soft phonons in TiSe(2) Otto, Martin R. Pöhls, Jan-Hendrik René de Cotret, Laurent P. Stern, Mark J. Sutton, Mark Siwick, Bradley J. Sci Adv Research Articles The complex coupling between charge carriers and phonons is responsible for diverse phenomena in condensed matter. We apply ultrafast electron diffuse scattering to unravel electron-phonon coupling phenomena in 1T-TiSe(2) in both momentum and time. We are able to distinguish effects due to the real part of the many-body bare electronic susceptibility, [Formula: see text] , from those due to the electron-phonon coupling vertex, g(q), by following the response of semimetallic (normal-phase) 1T-TiSe(2) to the selective photo-doping of carriers into the electron pocket at the Fermi level. Quasi-impulsive and wave vector–specific renormalization of soft zone-boundary phonon frequencies (stiffening) is observed, followed by wave vector–independent electron-phonon equilibration. These results unravel the underlying mechanisms driving the phonon softening that is associated with the charge density wave transition at lower temperatures. American Association for the Advancement of Science 2021-05-12 /pmc/articles/PMC8115930/ /pubmed/33980488 http://dx.doi.org/10.1126/sciadv.abf2810 Text en Copyright © 2021 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC). https://creativecommons.org/licenses/by-nc/4.0/This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial license (https://creativecommons.org/licenses/by-nc/4.0/) , which permits use, distribution, and reproduction in any medium, so long as the resultant use is not for commercial advantage and provided the original work is properly cited.
spellingShingle Research Articles
Otto, Martin R.
Pöhls, Jan-Hendrik
René de Cotret, Laurent P.
Stern, Mark J.
Sutton, Mark
Siwick, Bradley J.
Mechanisms of electron-phonon coupling unraveled in momentum and time: The case of soft phonons in TiSe(2)
title Mechanisms of electron-phonon coupling unraveled in momentum and time: The case of soft phonons in TiSe(2)
title_full Mechanisms of electron-phonon coupling unraveled in momentum and time: The case of soft phonons in TiSe(2)
title_fullStr Mechanisms of electron-phonon coupling unraveled in momentum and time: The case of soft phonons in TiSe(2)
title_full_unstemmed Mechanisms of electron-phonon coupling unraveled in momentum and time: The case of soft phonons in TiSe(2)
title_short Mechanisms of electron-phonon coupling unraveled in momentum and time: The case of soft phonons in TiSe(2)
title_sort mechanisms of electron-phonon coupling unraveled in momentum and time: the case of soft phonons in tise(2)
topic Research Articles
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8115930/
https://www.ncbi.nlm.nih.gov/pubmed/33980488
http://dx.doi.org/10.1126/sciadv.abf2810
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