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arXiv 0908.3919cond-mat.quant-gasnlin.SIquant-ph
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强排斥BEC中的粒子-空穴不对称性与孤子的亮化

Particle-Hole Asymmetry and Brightening of Solitons in A Strongly Repulsive BEC

Radha Balakrishnan, Indubala I. Satija, Charles W. Clark

摘要:

本文研究了具有最近邻相互作用的硬核玻色子凝聚体中的孤波传播。对于这种强排斥系统,由自旋相干态平均得到的凝聚态序参量的演化方程不同于通常的Gross-Pitaevskii方程(GPE).当粒子-空穴不平衡时,系统中存在两种孤子:一种是暗孤子,当速度接近声速时,暗孤子消失;另一种是新的孤子,当速度接近声速时,暗孤子变亮并持续存在,在超声速下转变为周期性的波列.类似于GPE孤子,两个孤子的能量-动量色散的特征在于Lieb II模式。

英文摘要:

We study solitary wave propagation in the condensate of a system of hard-core bosons with nearest-neighbor interactions. For this strongly repulsive system, the evolution equation for the condensate order parameter of the system, obtained using spin coherent state averages is different from the usual Gross-Pitaevskii equation (GPE). The system is found to support two kinds of solitons when there is a particle-hole imbalance: a dark soliton that dies out as the velocity approaches the sound velocity, and a new type of soliton which brightens and persists all the way up to the sound velocity, transforming into a periodic wave train at supersonic speed. Analogous to the GPE soliton, the energy-momentum dispersion for both solitons is characterized by Lieb II modes.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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