Acta Scientiarum Naturalium Universitatis Pekinensis

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Renormalization Group Study of Superfluid Density in Two-Dimensional Boson System

HE Peisong, OH Sungjin, CHEN Yu, TIAN Guangshan   

  1. School of Physics, Peking University, Beijing 100871;
  • Received:2010-07-31 Online:2011-05-20 Published:2011-05-20


何培松, 吴成真, 陈宇, 田光善   

  1. 北京大学物理学院, 北京 100871;

Abstract: Superfluid density and stiffness of two-dimensional weakly interacting Boson system at zero temperature are calculated by one-loop renormalization group method using Holzmann-Baym formula. The result shows that when the contributions of high energy fluctuations dominate, both superfluid density and superfluid stiffness exhibit scaling behavior with respect to chemical potential. This result is qualitatively consistent with other researchers’result.

Key words: two-dimensional Boson system, superfluid density and stiffness, renormalization group

摘要: 利用Holzmann-Baym超流密度公式以及准确到一圈图的重整化群方法,计算了零温下二维弱相互作用玻色体系的超流密度和超流刚度。计算表明,当高能涨落的贡献占主导地位时,超流密度与超流刚度对化学势的依赖关系会呈现标度行为, 与前人的研究结果相一致。

关键词: 二维玻色子体系, 超流密度和刚度, 重整化群方法

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