On dissipative effects in volume plasmon response

18th International Conference on Recent Progress in Many-Body Theories

Reinhard, P.-G.^1 ; Krotscheck, E.^2,5 ; Suraud, E.^2,3,4,5

Institut für Theoretische Physik, Universitat Erlangen, Erlangen

D-91058, Germany^1

Physics Department, University at Buffalo, State University New York, United States^2

Universitéde Toulouse, UPS, Laboratoire de Physique Théorique (IRSAMC), Toulouse Cedex

F-31062, France^3

CNRS

LPT (IRSAMC), Universitéde Toulouse, Toulouse Cedex

F-31062, France^4

Institute for Theoretical Physics, JKU Linz Buffalo, Linz

NY

14260, Austria^5

关键词: Dissipative effects;    Mean field;    Mean field approach;    Non-linear regimes;    Quantum relaxation;    Sodium clusters;    Volume plasmon;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/702/1/012009/pdf
DOI  :  10.1088/1742-6596/702/1/012009

来源: IOP

【 摘 要 】

We study the imortance of dissipation on the volume plasmon response in moderate size Sodium clusters. Volume plasmon response has been tentatively identified experimentally in Sodium clusters. An open question is whether the standard mean-field approach, based on Density Functional Theory (DFT), is sufficient to provide a proper description of such modes in a possibly non-linear regime of excitations. A conceptually simple approximation, based on a recently proposed quantum Relaxation Time Ansatz (RTA), is used to evaluate these effects. It turns out that the response is, in the explored cases, clearly dominated by the mean field, which allows the use of simplified theories that give access to larger systems.