A transition in the spectral statistics of quantum optical model by different electromagnetic fields
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- 作者：Hadi Sabri ; Ahad ollah Ezzati
- 关键词：Statistical and Nonlinear Physics
- 刊名：The European Physical Journal B
- 出版年：2017
- 出版时间：February 2017
- 年：2017
- 卷：90
- 期：2
- 全文大小：
- 刊物类别：Physics and Astronomy
- 刊物主题：Condensed Matter Physics; Physics, general; Complex Systems; Fluid- and Aerodynamics; Solid State Physics;
- 出版者：Springer Berlin Heidelberg
- ISSN：1434-6036
- 卷排序：90
文摘
In this paper, we have considered the effects of different quantized electromagnetic fields on the spectral statistics of two-level atoms. The Berry-Robnik distribution and the maximum likelihood estimation technique are used to analyze the effect of the mean photon numbers, the two level atoms numbers and also the quantum number of considered states on the fluctuation properties of different systems which are described by different sets of the Dicke Hamiltonian’s parameters. Our results describe the obvious effect of mean photon number on the spectral statistics and show more regular dynamics when this quantity reaches 700. Also, we observed universality in the spectral statistics of considered systems when the number of two level atoms approaches an unrealistic limit (NA ~ 200) and there are some suggestions about the effect of the quantum number of selected levels and the atom-field coupling constant on level statistics.