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  Coherent and incoherent structural dynamics in laser-excited antimony

Waldecker, L., Vasileiadis, T., Bertoni, R., Ernstorfer, R., Zier, T., Valencia, F. H., et al. (2017). Coherent and incoherent structural dynamics in laser-excited antimony. Physical Review B, 95(5): 054302. doi:10.1103/PhysRevB.95.054302.

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 Creators:
Waldecker, Lutz1, 2, Author           
Vasileiadis, Thomas1, Author           
Bertoni, Roman1, 3, Author           
Ernstorfer, Ralph1, Author           
Zier, Tobias4, Author
Valencia, Felipe H.4, 5, Author
Garcia, Martin E.4, Author
Zijlstra, Eeuwe S.4, Author
Affiliations:
1Physical Chemistry, Fritz Haber Institute, Max Planck Society, ou_634546              
2Stanford University, 348 Via Pueblo Mall, Stanford, California 94305, USA, ou_persistent22              
3Université de Rennes 1, Institut de Physique de Rennes, 263 av. Général Leclerc 35042 Rennes cedex, France, ou_persistent22              
4Theoretische Physik, Universität Kassel and Center for Interdisciplinary Nanostructure Science and Technology (CINSaT), Heinrich-Plett-Straße 40, 34132 Kassel, Germany, ou_persistent22              
5Physics Department, Universidad Nacional de Colombia, Edificio 404, Ciudad Universitaria, Bogotá, Colombia, ou_persistent22              

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 Abstract: We investigate the excitation of phonons in photoexcited antimony and demonstrate that the entire electron-lattice interactions, in particular coherent and incoherent electron-phonon coupling, can be probed simultaneously. Using femtosecond electron diffraction (FED) with high temporal resolution, we observe the coherent excitation of the fully symmetric A1g optical phonon mode via the shift of the minimum of the atomic potential energy surface. Ab initio molecular dynamics simulations on laser excited potential energy surfaces are performed to quantify the change in lattice potential and the associated real-space amplitude of the coherent atomic oscillations. Good agreement is obtained between the parameter-free calculations and the experiment. In addition, our experimental configuration allows observing the energy transfer from electrons to phonons via incoherent electron-lattice scattering events. The electron-phonon coupling is determined as a function of electronic temperature from our DFT calculations and the data by applying different models for the energy transfer.

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 Dates: 2016-12-302016-08-112017-02-012017-02-01
 Publication Status: Issued
 Pages: 8
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1103/PhysRevB.95.054302
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Title: Physical Review B
  Abbreviation : Phys. Rev. B
Source Genre: Journal
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Publ. Info: Woodbury, NY : American Physical Society
Pages: 8 Volume / Issue: 95 (5) Sequence Number: 054302 Start / End Page: - Identifier: ISSN: 1098-0121
CoNE: https://pure.mpg.de/cone/journals/resource/954925225008