| Weak-Coupling Theory for Semiclassical Periodically Driven Two-Level Systems： Beyond Rotating-Wave Approximation |
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| 作者姓名： | YANG Xiao-Xue WU Ying |
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| 作者单位： | Department of Physics, Huazhong University of Science and Technology, Wuhan 430074, China |
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| 基金项目： | The project supported by National Natural Science Foundation of China under Grant Nos. 10575040, 90503010, 60478029, and 10634060, and by the State Key Basic Research Program under Grant No. 2005CB724508 |
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| 摘 要： | In this paper,(2 1)-dimensional electron acoustic waves (EAW) in an unmagnetized collisionless plasma have been studied by the linearized method and the reductive perturbation technique,respectively.The dispersion relation and a modified Kadomtsev-Petviashvili (KP) equation have been obtained for the EAW in the plasma considering a cold electron fluid and a vortex-like hot electrons.It is found from some numerical results that the parameter β (the ratio of the free hot electron temperature to the hot trapped electron temperature) effects on the amplitude and the width of the electron acoustic solitary waves (EASW).It can be indicated that the free hot electron temperature and the hot trapped electron temperature have very important effect on the characters of the propagation for the EASW.
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| 关 键 词： | 疏耦合理论 双标准系统 波动理论 物理分析 |
| 修稿时间： | 2006-12-13 |
(2+1)-Dimensional Electron Acoustic Solitary Waves in an Unmagnetized Collisionless Plasma with Vortex-Like Hot Electrons |
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| YANG Xiao-Xue WU Ying.(2+1)-Dimensional Electron Acoustic Solitary Waves in an Unmagnetized Collisionless Plasma with Vortex-Like Hot Electrons[J].Communications in Theoretical Physics,2007,47(2):339-342. |
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| Authors: | LIN Mai-Mai DUAN Wen-Shan |
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| Abstract: | We present a weak-coupling theory of semiclassical periodically driven two-level systems. The explicit analytical approximating solution is shown to reproduce highly accurately the exact results well beyond the regime of the rotating-wave approximation. |
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| Keywords: | periodically driven two-level systems weak-coupling theory beyond rotating-wave approximation |
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