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arXiv 2402.19239cond-mat.quant-gashep-ph
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从单圈微扰重整化群看玻色-爱因斯坦凝聚体中的玻戈留波夫声子

Bogoliubov phonons in a Bose-Einstein condensate from the one-loop perturbative renormalization group

Niklas Rasch, Aleksandr N. Mikheev, Thomas Gasenzer

AI总结:

本文在对称性破缺凝聚相下,扩展Bijlsma和Stoof的工作,纳入时间导数波函数重整化,通过重标度方案实现耦合流收敛,可确定凝聚体损耗及临界温度偏移。

摘要:

在对称性破缺的凝聚相内,本文讨论了弱相互作用单组分玻色气体的Wilson重整化群方法。在Bijlsma和Stoof的工作[Phys. Rev. A 54, 5085 (1996),见http://doi.org/10.1103/PhysRevA.54.5085]基础上进行扩展,纳入了时间导数对有效作用量贡献的波函数重整化,以捕捉波长大于愈合长度尺度的类声准粒子激发。通过合适的重标度方案,我们实现了耦合流的收敛,这可用于依据玻戈留波夫理论确定凝聚体损耗,以及相互作用诱导的临界温度偏移。

英文摘要:

Wilson's renormalization-group approach to the weakly-interacting single-component Bose gas is discussed within the symmetry-broken, condensate phase. Extending upon the work by Bijlsma and Stoof [Phys. Rev. A 54, 5085 (1996), see http://doi.org/10.1103/PhysRevA.54.5085 ], wave-function renormalization of the temporal derivative contributions to the effective action is included in order to capture sound-like quasiparticle excitations with wave lengths larger than the healing-length scale. By means of a suitable rescaling scheme we achieve convergence of the coupling flows, which serve as a means to determine the condensate depletion in accordance with Bogoliubov theory, as well as the interaction-induced shift of the critical temperature.

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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