Collective modes in free plasmas subjected to a radiation field

15th International Congress on Plasma Physics; 13th Latin American Workshop on Plasma Physics

Ribeiro, B.V.^1 ; Santos, D.D.A.^1 ; Amato, M.A.^1,2 ; Fonseca, A.L.A.^1,2

Instituto de Fsica, Universidade de Brasilia, Campus Darcy Ribeiro, Brasilia, Brazil^1

International Centre for Condensed Matter Physics, Universidade de Brasilia, Campus Darcy Ribeiro, Braslia, Brazil^2

关键词: Collective modes;    External fields;    Frequency ranges;    Plasmon frequency;    Quantum mechanical;    Radiation field;    Semi-classical approximation;    Single photon process;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/511/1/012005/pdf
DOI  :  10.1088/1742-6596/511/1/012005

来源: IOP

【 摘 要 】

In this study we report the effects of an electromagnetic field on the physical properties of free plasmas3.The calculations are carried out in the semi-classical approximation, i.e., the electromagnetic field is treated classically and the electrons from a quantum mechanical viewpoint. The results show that the collective modes are damped away more smoothly and in a smaller frequency range than those reported by previous studies. An exponential-like decay of the frequencies is readily observable from the plot of the plasmon frequency as a function of the external field amplitude. We successfully recreate the results of previous studies. We also obtain that the single photon processes has a pronounced effect on the decrease of the frequency range of modulation.