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两分量Bose-Einstein凝聚体的非线性Ramsey干涉

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物理学报 2009年第7期58卷 4396-4401页

作者：栗生长段文山西北师范大学物理与电子工程学院兰州730070

以非线性Rosen-Zener隧穿理论为基础,用两分量Bose-Einstein凝聚体设计了非线性Ramsey干涉计.通过数值模拟实验在时间域上观察到了丰富的Ramsey干涉图样,凝聚体中原子间重要的非线性相互作用导致这些干涉图样明显不同于线性Ramsey干涉... 详细信息

以非线性Rosen-Zener隧穿理论为基础,用两分量Bose-Einstein凝聚体设计了非线性Ramsey干涉计.通过数值模拟实验在时间域上观察到了丰富的Ramsey干涉图样,凝聚体中原子间重要的非线性相互作用导致这些干涉图样明显不同于线性Ramsey干涉时的正弦型条纹.通过进一步对干涉图样作Fourier分析,发现干涉图样的基频能够精确反映系统的非线性和不对称性特征,从而为测量原子的相关性质提供了理论依据.

关键词： Bose-Einstein凝聚非线性Ramsey干涉 Rosen-Zener隧穿

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二维热离子等离子体中离子声孤波的相互作用

物理学报 2008年第10期57卷 6068-6073页

作者：韩久宁王苍龙栗生长段文山西北师范大学物理与电子工程学院兰州730070

通过使用推广的Poincar-Lighthill-Kuo摄动方法,研究了二维热离子等离子体中两个沿不同方向传播的离子声孤波的相互作用,得到了两个分别描述沿ξ和η方向传播的孤波的KdV方程以及两个孤波以任意夹角碰撞后的相移和轨道.同时还研究了离... 详细信息

通过使用推广的Poincar-Lighthill-Kuo摄动方法,研究了二维热离子等离子体中两个沿不同方向传播的离子声孤波的相互作用,得到了两个分别描述沿ξ和η方向传播的孤波的KdV方程以及两个孤波以任意夹角碰撞后的相移和轨道.同时还研究了离子温度比σ、热容比γ和碰撞夹角α对孤波相移的影响.研究表明,这些参量可以明显地改变孤波的相移,且在该系统中存在压缩型孤波.

关键词：热离子等离子体离子声孤波 Poincar-Lighthill-Kuo方法相移

Modulational instability for a self-attractive two-component Bose-Einstein condensate

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Chinese Physics B 2009年第10期18卷 4177-4181页

作者：栗生长段文山 College of Physics and Electronic Engineering Northwest Normal University

By means of the multiple-scale expansion method, the coupled nonlinear Schrgdinger equations without an explicit external potential are obtained in two-dimensional geometry for a self-attractive Bose-Einstein condensate composed of different hyperfine states. The modulational instability of two-component condensate is investigated by using a simple technique. Based on the discussion about two typical cases, the explicit expression of the growth rate for a purely growing modulational instability and the optimum stable conditions are given and analysed analytically. The results show that the modulational instability of this two-dimensional system is quite different from that in a one-dimensional system.

关键词： modulational instability Bose-Einstein condensate multiple-scale expansion method

Rosen-Zener Transition in a Nonlinear System for Two-Component Bose-Einstein Condensates in Optical Lattices

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Chinese Physics Letters 2009年第1期26卷 88-91页

作者：姜欣林麦麦栗生长段文山 College of Physics and Electronic Engineering Northwest Normal University Lanzhou 730070

We study the Rosen-Zener transition （RZT） in a nonlinear system for two-component Bose-Einstein condensates in optical lattices. It is found that the percentage of the components could affect the quantum transition dramatically. For the component with large percentage it is equivalent that the effect of the nonlinearity is stronger, whereas for the component with small percentage the effect is weaker. We also find that the nonlinearity c11 can affect the quantum transition dramatically. This is similar to that reported from Ref. [14]. Compared with one-component systems, however, the effect of the nonlinearity is decreased due to the two components of the BEGs in optical lattices. Furthermore, the effect of the coupling nonlinearity between two components c12 is studied. The component with large percentage is more affected by the nonlinearity than that with small-percentage component.

关键词： BOSE-Einstein condensation NONLINEAR systems LATTICE theory QUANTUM theory OPTICS NUMERICAL analysis

Controllable optical bistability of Bose-Einstein condensate in an optical cavity with a Kerr medium

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Chinese Physics B 2012年第9期21卷 229-233页

作者：郑强栗生长张小平游泰杰傅立斌 School of Mathematics and Computer Science Guizhou Normal University Institute of Applied Physics and Computational Mathematics Department of Engineering Physics Tsinghua University

We study the optical bistability for a Bose-Einstein condensate of atoms in a driven optical cavity with a Kerr medium. We find that both the threshold point of optical bistability transition and the width of optical bistability hysteresis can be controlled by appropriately adjusting the Kerr interaction between the photons. In particular, we show that the optical bistability will disappear when the Kerr interaction exceeds a critical value.

关键词： Bose-Einstein condensate optical bistability Kerr interaction

Phase Shifts during Interaction between Two Solitons in Two-Dimensional Dusty Plasma

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Chinese Physics Letters 2007年第8期24卷 2312-2315页

作者：栗生长吴利华林麦麦段文山 College of Physics and Electronic Engineering Northwest Normal University Lanzhou 730070

The dust acoustic solitary waves propagating in two different directions in two-dimensional dusty plasma are investigated. In order to study the soliton interactions in multi-dimensional systems, we extend the reductive perturbation method and obtain two Kortewe-de Vries equations for nonlinear waves in both the ξ and 77 directions, respectively. The phase shifts after collision of two solitons with arbitrary angle are given. Finally, the solution of na up to O（ε^4） order is obtained.

关键词： ACOUSTIC-WAVES SOLITARY WAVES VORTEX-LIKE

相互作用玻色系统的Berry相位和Hannay角

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相互作用玻色系统的Berry相位和Hannay角

第十六届全国原子与分子物理学术会议

作者：栗生长刘杰傅立斌北京应用物理与计算数学研究所

本文研究了一个相互作用两模玻色体系的Berry相和Hannay角并且得到了他们的解析表达式.讨论了Berry相和Hannay角之间的关系.研究发现,在大粒子数极限下,经典Hannay角等于负的量子Berry相对总粒子数的一阶偏导数.这个关系也适用于其他的...

本文研究了一个相互作用两模玻色体系的Berry相和Hannay角并且得到了他们的解析表达式.讨论了Berry相和Hannay角之间的关系.研究发现,在大粒子数极限下,经典Hannay角等于负的量子Berry相对总粒子数的一阶偏导数.这个关系也适用于其他的玻色系统,只要这

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准静态过程及相关物理概念教学探析

物理通报 2016年第3期45卷 22-24,28页

作者：栗生长张杨西安交通大学理学院

本文运用类比方法，引入爬台阶这一常见生活实例，通过对其作细致的定性和定量分析，直观形象地类比了热力学中的准静态过程及相关物理概念，揭示了平衡态、非平衡态、弛豫时问等概念之间以及他们跟准静态过程的内在联系和本质区别，进... 详细信息

本文运用类比方法，引入爬台阶这一常见生活实例，通过对其作细致的定性和定量分析，直观形象地类比了热力学中的准静态过程及相关物理概念，揭示了平衡态、非平衡态、弛豫时问等概念之间以及他们跟准静态过程的内在联系和本质区别，进一步明确了将实际过程近似为准静态过程的定量条件．

关键词：平衡态弛豫时间准静态过程

The interaction of nonlinear waves in two-dimensional lattice

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Chinese Physics B 2008年第8期17卷 2989-2993页

作者：杨晓霞段文山栗生长韩久宁 College of Physics and Electronics Engineering Northwest Normal University

This paper investigates the collision between two nonlinear waves with arbitrary angle in two-dimensional nonlinear lattice. By using the extended Poincarge-Lighthill-Kuo perturbation method, it obtains two Korteweg-de Vries equations for nonlinear waves in both the ζ and η directions, respectively, and derives the analytical phase shifts after the collision of two nonlinear waves. Finally, the solution of u（υ） up to O（ε^3） order is given.

关键词： nonlinear waves two-dimensional nonlinear lattice phase shift