计算物理 ›› 2012, Vol. 29 ›› Issue (3): 466-474.

• 论文 • 上一篇    

Feshbach共振下BCS-BEC渡越量子分析

李婧1, 刘彬2   

  1. 1. 北京理工大学理学院, 北京, 100081;
    2. 北京大学应用物理与技术研究中心, 北京, 100084
  • 收稿日期:2011-09-05 修回日期:2011-11-21 出版日期:2012-05-25 发布日期:2012-05-25
  • 作者简介:李婧(1985-),女,博士,主要从事超冷原子-分子转化非线性动力学研究,E-mail:xiaojingzi238@126.com

Quantum Analysis of BCS-BEC Crossover in Feshbach Resonances

LI Jing1, LIU Bin2   

  1. 1. School of Science, Beijing Institute of Technology, Beijing 100081, China;
    2. Center for Applied Physics and Technology, Peking University, Beijing 100084, China
  • Received:2011-09-05 Revised:2011-11-21 Online:2012-05-25 Published:2012-05-25

摘要: 考虑一个涵盖分子间相互作用的多体模型,给出一种半解析计算模型中费米原子对转化成玻色分子转化率的有效方法.这种方法主要使用独立交叉近似,并在平均场理论下推导出一个精确计算转化率的解析公式.对比分析证明,该解析公式的计算结果得到多体模型的数值分析的支持,并与Rice小组的6Li实验能够很好的吻合.

关键词: Feshbach共振, 独立交叉近似, BCS-BEC渡越

Abstract: We consider a many-particle model which concludes interaction of molecular BEC,and gave a semi-analytical method to calculate conversion efficiency of Fermion atom pairs convert to Boson molecules.The method used mainly independent crossing approximation.With mean-field theory we get an equation for conversione efficiency.Calculating results are supported by numerical simulation and experiment of 6Li by Hulet group in 2003.

Key words: Feshbach resonance, ICA, BCS-BEC crossover

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