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

E. M. Bothschafter, A. Paarmann, N. Karpowicz, E. S. Zijlstra, M. E. Garcia, F. Krausz, R. Kienberger, R. Ernstorfer

Publikation: Beitrag in Buch/Bericht/KonferenzbandKonferenzbeitragBegutachtung

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.

OriginalspracheEnglisch
Titel18th International Conference on Ultrafast Phenomena, UP 2012
DOIs
PublikationsstatusVeröffentlicht - 2013
Veranstaltung18th International Conference on Ultrafast Phenomena, UP 2012 - Lausanne, Schweiz
Dauer: 8 Juli 201213 Juli 2012

Publikationsreihe

NameEPJ Web of Conferences
Band41
ISSN (Print)2101-6275
ISSN (elektronisch)2100-014X

Konferenz

Konferenz18th International Conference on Ultrafast Phenomena, UP 2012
Land/GebietSchweiz
OrtLausanne
Zeitraum8/07/1213/07/12

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