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  Interband excitation and carrier relaxation as displacive driving force for coherent phonons

Bothschafter, E., Paarmann, A., Karpowicz, N., Zijlstra, E., Garcia, M., Krausz, F., et al. (2013). Interband excitation and carrier relaxation as displacive driving force for coherent phonons. EPJ Web of Conferences, 41: 04021. doi:10.1051/epjconf/20134104021.

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Item Permalink: https://hdl.handle.net/11858/00-001M-0000-0027-BFDF-A Version Permalink: https://hdl.handle.net/21.11116/0000-000D-483B-1
Genre: Journal Article

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epjconf_up2012_04021.pdf (Publisher version), 824KB
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Copyright Date:
2013
Copyright Info:
EDP Sciences
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http://creativecommons.org/licenses/by-nc/3.0/

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 Creators:
Bothschafter, Elisabeth1, 2, Author
Paarmann, Alexander3, Author           
Karpowicz, Nicholas2, Author
Zijlstra, E.S.4, Author
Garcia, M.E.4, Author
Krausz, F.1, 5, Author
Kienberger, Reinhard1, 2, Author
Ernstorfer, Ralph3, Author           
Affiliations:
1Technical University Munich, Department of Physics, 85748 Garching, Germany , ou_persistent22              
2Attosecond Dynamics, Laboratory for Attosecond Physics, Max Planck Institute of Quantum Optics, Max Planck Society, ou_1445573              
3Physical Chemistry, Fritz Haber Institute, Max Planck Society, ou_634546              
4University Kassel, Theoretical Physics Department, 34132 Kassel, Germany , ou_persistent22              
5Ludwig Maximilian University Munich, Faculty of Physics, 85748 Garching, Germany , ou_persistent22              

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 Abstract: We report on displacive excitation of large amplitude coherent lattice motions in TiO2 under resonant conditions using sub-6-femtosecond UV pulses. Calculations of non-equilibrium potential energy surfaces reveal a new displacive mechanism for the coherent phonon generation, where a unidirectional displacement of the phonon potential occurs both instantaneously due to carrier excitation and dynamically due to cooling of the hot photo-excited carriers. The carrier cooling dynamics in TiO2 are faster than the phonon period, resulting in an initially anharmonic lattice motion. This effect manifests itself in an effective phase shift of the coherent phonon oscillation, in good agreement between our experiments and the calculations.

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Language(s): eng - English
 Dates: 20132013-03-13
 Publication Status: Published online
 Pages: 3
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1051/epjconf/20134104021
 Degree: -

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Title: EPJ Web of Conferences
Source Genre: Journal
 Creator(s):
Chergui, Majed, Editor
Taylor, Antoinette, Editor
Cundiff, Steven, Editor
de Vivie-Riedle, Regina, Editor
Yamagouchi, Kaoru, Editor
Affiliations:
-
Publ. Info: Les Ulis : EDP Sciences
Pages: - Volume / Issue: 41 Sequence Number: 04021 Start / End Page: - Identifier: CoNE: https://pure.mpg.de/cone/journals/resource/2100-014X