We explore the impact of dissipation on the response of clusters and molecules to a laser field whereby dissipation is treated at the level of a quantum Relaxation Time Approach (RTA). Test cases are the metal cluster Na40 with pronounced plasmon response and, for comparison, the H2O molecule with strong spectral fragmentation. Laser parameters are selected according to the spectral properties of the considered systems. We consider both on and off resonance laser irradiation and compare dynamical response in terms of net ionization, absorbed energy, and dipole response. The impact of dissipation is tested by comparison of results from RTA with mere mean-field dynamics at the level of time-dependent density functional theory. Only little differences between dissipative and mean-field dynamics are observed for off resonance irradiations. The situation is totally different for laser frequencies matching a resonance where we observe qualitative differences between the RTA and mean-field evolutions.
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March 2018
Research Article|
March 29 2018
The impact of dissipation on plasmonic versus non-collective excitation
Special Collection:
Plasmonics and Solid State Plasmas
M. Vincendon;
M. Vincendon
1
Université de Toulouse, UPS, Laboratoire de Physique Théorique, IRSAMC
, F-31062 Toulouse Cedex, France
2
CNRS, UMR5152
, F-31062 Toulouse Cedex, France
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P.-G. Reinhard;
P.-G. Reinhard
3
Institut für Theoretische Physik, Universität Erlangen
, Staudtstraße 7, D-91058 Erlangen, Germany
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E. Suraud
E. Suraud
1
Université de Toulouse, UPS, Laboratoire de Physique Théorique, IRSAMC
, F-31062 Toulouse Cedex, France
2
CNRS, UMR5152
, F-31062 Toulouse Cedex, France
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Phys. Plasmas 25, 031905 (2018)
Article history
Received:
December 06 2017
Accepted:
February 09 2018
Citation
M. Vincendon, P.-G. Reinhard, E. Suraud; The impact of dissipation on plasmonic versus non-collective excitation. Phys. Plasmas 1 March 2018; 25 (3): 031905. https://doi.org/10.1063/1.5018404
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