被束缚玻色气体的动力结构因子与动量分布
摘要
在玻色-爱因斯坦凝聚气的零温下，研究了其动力结构因子。在动量传递的不同值下进行考虑，其范围从声子模式到单粒子模式。讨论了各种近似方案，包括局域密度近似（其中该系统在局部被描述为均匀气体）和冲击近似（其中响应由凝聚物的动量分布决定）。 presented a comprehensive approach based on the eikonal expansion. The predictions of theory are successfully compared with the results of recent two-photon Bragg scattering experiments, both at low and high momentum transfer. Relevant features of the dynamic structure factor are also discussed using the formalism of sum rules and the concept of scaling. Particular emphasis is given to the regime of high momentum transfer, where the dynamic structure factor is sensitive to the behaviour of the order parameter in momentum space, and some instructive examples showing the consequence of long-range coherence are presented.
引用
@article{arxiv.cond-mat/9912089,
title = {Dynamic structure factor and momentum distribution of a trapped Bose gas},
author = {F. Zambelli and L. P. Pitaevskii and D. M. Stamper-Kurn and S. Stringari},
journal= {arXiv preprint arXiv:cond-mat/9912089},
year = {2009}
}
备注
29 pages, 12 figures