Perturbation Theory for Superfluid in Nonuniform Potential
Perturbation Theory for Superfluid in Nonuniform Potential
复制标题
非均匀势超流体的微扰理论
DOI：
10.1007/s10909-015-1394-7
复制
发表时间：
2016
影响因子：
2
通讯作者：
Y. Kato
中科院分区：
文献类型：
--
作者：
S. Koshida;Y. Kato
建立了非均匀势下超流分数的微扰理论。我们发现主导项的系数由系统的动力学结构因子或密度涨落决定。对理想玻色气体和具有线性色散的相互作用玻色系统的结果与朗道判据的推论一致。我们还发现Tomonaga-Luttinger液体的超流性对非均匀势是稳定的。
Perturbation theory of superfluid fraction in terms of nonuniform potential is constructed. We find that the coefficient of the leading term is determined by the dynamical structure factor or density fluctuation of the system. The results for the ideal Bose gas and the interacting Bose system with linear dispersion are consistent to implications from Landau’s criterion. We also find that the superfluidity of Tomonaga–Luttinger liquid withis shown to be stable against nonuniform potential.