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

Bothschafter, Elisabeth; Paarmann, Alexander; Karpowicz, Nicholas; Zijlstra, E.S.; Garcia, M.E.; Krausz, F.; Kienberger, Reinhard; Ernstorfer, Ralph

doi:10.1051/epjconf/20134104021

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

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Bothschafter, Elisabeth
Technical University Munich, Department of Physics;
Attosecond Dynamics, Laboratory for Attosecond Physics, Max Planck Institute of Quantum Optics, Max Planck Society;

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Paarmann, Alexander
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Karpowicz, Nicholas
Attosecond Dynamics, Laboratory for Attosecond Physics, Max Planck Institute of Quantum Optics, Max Planck Society;

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Kienberger, Reinhard
Technical University Munich, Department of Physics;
Attosecond Dynamics, Laboratory for Attosecond Physics, Max Planck Institute of Quantum Optics, Max Planck Society;

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Ernstorfer, Ralph
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Citation

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.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0027-BFDF-A

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.