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We investigate the dynamics of two-dimensional matter-wave pulses in a Bose-Einstein condensate with diskshaped traps.For the case of repulsive atom-atom interactions,a Kadomtsev-Petviashvili equation with positive dipersion is derived using the method of multiple scales.The results show that it is possible to excite dark lump-like two-dimensional nonlinear excitations in the Bose-Einstein condensate. 相似文献
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YUZhao-Xian ZHANGWei-Gang 《理论物理通讯》2002,37(1):39-44
We have studied quantum statistical properties in a zero-temperature two-species Bose-Einstein condensate system in the presence of the nonlinear self-interaction of each species,the interspecies nonlinear interaction,and the Jisephson-like tunneling interaction.It is found that the two condensates may periodically exhibit sub-Poissonian distribution.It is revealed that the correlation between the two condensates can be nonclassical,which means that there exists a violation of Cauchy-Schwartz inequality.The nonclassical effect about the correlation between the two condensates can be realized experimentally by properly preparing the total number of atoms in the two condensates. 相似文献
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YUZhao-Xiao JIAOZhi-Yong 《理论物理通讯》2001,36(2):240-244
It is shown that the atomic tunneling current and the Shapiro-like steps strongly depend on the initial number of atoms in each condensate and the initial phase difference between the two condensates which are initially in even(odd) coherent states.The nonlinearity of interatomic interactions in the two condensates may lead to the atomic tunneling current and Shapiro-like step between the two condensates.It is found that the interatomic nonlinear interactions can induce the atomic tunneling current and Shapiro-like step between two condensates even though there does not exist the interspecies Josephson-like tunneling coupling.The static atomic tunneling current flows in positive or negative direction,which depends on the phase difference of the two-species condensates. 相似文献
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本文首次报道了用共振多光子电离(RMPI)技术探测到四条在可见光范围内的Gd原子强双光子跃迁线.观察到双色三光子Gd原子激光同位素分离.研究了高分辨率Gd原子电离谱,并解释了电离谱的线型. 相似文献
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230—245nm范围内Cl原子共振增强多光子电离光谱 总被引:1,自引:0,他引:1
利用共振增强多光子电离--时间飞行质谱技术获得了Cl原子在230-245nm范围内的代振增强多光子电离光谱,共观察到26条谱线,其中5条是作者新观察到的,这些谱线对应从Cl原子基态到激发态的双光子跃迁。从中还观察到Cl原子在强电场中的Stark效应,发现在强场条件下,Cld原子绵基太^2P1/2^0和^2P3/2^0两能级之间的能工位移1.35cm^=1。而各电子激发态的Stark位移则大致相等, 相似文献
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本文用B样条方法计算了受限氯原子的能级与波函数,并在此基础上研究了氯原子的跃迁谱特性,发现了在限制势的作用下,氯原子跃迁谱有非常强的共振增强现象出现。 相似文献
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在钠蒸气中,分别通过原子和分子的双光子共振三光子电离和双光子混合共振三光子电离两种激发机制,测得了不同温度下的电离信号激发谱,对结果作了较为详细的分析。 相似文献
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利用原子-腔场共振相互作用制备多原子缠结态 总被引:1,自引:0,他引:1
提出了一个利用量子腔场与原子的共振相互作用制备多原子缠结态的方案.首先将一个初态制备在基态和激发态的叠加态的二能级原子注入一个真空态腔场中.原子通过腔时产生原子-场缠结.制备于基态的其它二能级原子分别以不同角度注入腔场,在与腔场相互作用时可制得多原子缠结态,而空腔仍然保持在真空态.与现存的方案比较,该方案在实验上更容易实现. 相似文献
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使用R-矩阵方法,采用三态密耦图象计算了锂原子激发态1s^22p^2P的光电离截面,并给出了不同分波及不同过程的截面,计算结果揭示了光电离过程中的Rydberg系列共振,并指出在非共振区光电离截面不是单调变化的。 相似文献
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Coherent Superposition States of Atoms and Molecules in a Bose—Einstein Condensate with Exactly Bananced Photo—Associations and Photo—Dissociations 下载免费PDF全文
We show that there exist a series of coherent superposition states of atoms and molecules in a dilute Bose-Einstein condensate with exactly balanced photo-associations and photo-dissociations,and their analytical expressions are explicitly given.They also correspond to the coherent superposition states of two kinds of hpotons in optical second harmonic generation processes,which shows exactly balaced down-and up-conversions. 相似文献
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本文用B样条方法计算了受限氦原子的能级与波函数,并在此基础上研究了氦原子的跃迁谱特性,发现了在限制势的作用下,氦原子跃迁谱有非常强的共振增强现象出现. 相似文献
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详细分析一种简单的非变分式的组态相互作用理论,用于研究双价原子系统。用这种理论精确求解该系统的多组态状态波函数及其相应的能量本征值,并定量地分析组态之间的相互作用,它反映了电子之间的交换作用和相关作用.使用一组由B-spline构成的近乎完全的有限基函数,可以有效地考虑到被限制在有限体积内的正能量单电子轨道对连续区所作的贡献。具体计算典型的双价原子-Be原子,所得结果和实验数据相比较,符合得很好. 相似文献
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本文提出了推求复杂组态L-S耦合谱项波函数的系统方法,着重解决了推求多重谱项的谱项波函数这一难题,运用PASCAL语言编制了计算程序,利用本程序可快速、准确地求出等效组态的s^N,p^N,d^N,g^N,i^N,k^N的L-S耦合谱项和谱项波函数 相似文献
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