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arXiv 2603.20439cond-mat.quant-gasphysics.atom-phquant-ph
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Bose凝聚体链的干涉(Pitaevskii-Gross近似)

Interference of a chain of Bose condensates in the Pitaevskii-Gross approximation

Department of Physics, Lomonosov Moscow State University(莫斯科国立大学物理系);International Center for Quantum Optics and Quantum Technologies LLC(国际量子光学与量子技术有限责任公司);A.V. Gaponov-Grekhov Institute of Applied Physics of the Russian Academy of Sciences(俄罗斯科学院A.V.加波诺夫-格雷霍夫应用物理研究所);Moscow Institute of Physics and Technology(莫斯科物理技术学院)

I. N. Mosaki, A. V. Turlapov

AI总结:

研究Bose凝聚体链在光学晶格释放后的干涉现象,分析相位波动对干涉条纹的影响,并通过Pitaevskii-Gross方程计算与实验对比。

摘要:

一个长链的Bose凝聚体在自由扩展后发生干涉,无论相位相等还是波动,干涉条纹均清晰可辨。在相位波动情况下,条纹位置也波动,但空间密度分布谱仍可重复。谱中可区分两种峰值,一种由相位波动引起,另一种与凝聚体间相干有关。基于Pitaevskii-Gross方程计算干涉并对比实验[Phys. Rev. Lett. 122, 090403 (2019)],计算结果能复现谱峰位置及相互作用依赖性,但部分峰值高度与实验结果有差异。

英文摘要:

A long chain of Bose condensates freely expands and interferes after being released from an optical lattice. The interference fringes are well resolved both in the case of equal phases of the condensates and in the case of fluctuating phases. In the second case the positions of the fringes also fluctuate. The spectrum of the spatial density distribution, however, is reproducible despite the fluctuations. Moreover two types of peaks are distinguishable in the spectrum. The first type arises due to the phase fluctuations, the second type is associated with the coherence between the condensates. In the framework of the Pitaevskii-Gross equation we calculate the interference of the condensates and compare the calculation with experiment [Phys. Rev. Lett. 122, 090403 (2019)]. The calculation reproduces the positions of the spectrum peaks, including the dependence on the interparticle interaction. The calculated heights of the peaks, however, in some cases differ with the experimental ones.

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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