Superfluid density of two-dimensional weakly interacting boson system at zero temperature  

作　　者：HE PeiSong FAN YuWei 

机构地区：[1]School of Physics, Peking University, Beijing 100871, China [2]Yuanpei College, Peking University, Beijing 100871, China

出　　处：《Chinese Science Bulletin》2011年第12期1230-1233,共4页

摘　　要：We compute the superfluid density of a two-dimensional boson system with weak two-body repulsive interactions at zero temperature using one-loop perturbation theory in the weak coupling region. The boson fields are taken to be in continuum form in real space, and the interactions are approximated by a δ function of the distance between the bosons. We find that the one-loop fluctuations slightly decrease the superfluid density of a classical level. The superfluid density is approximated by the condensate density multiplied by the mass of the boson particle.We compute the superfluid density of a two-dimensional boson system with weak two-body repulsive interactions at zero temperature using one-loop perturbation theory in the weak coupling region. The boson fields are taken to be in continuum form in real space, and the interactions are approximated by a/~ function of the distance between the bosons. We find that the one-loop fluctuations slightly decrease the superfluid density of a classical level. The superfluid density is approximated by the condensate density multiplied by the mass of the boson particle.

关 键 词：玻色子系统 弱相互作用 流密度 温度 二维 摄动理论 现实空间 函数近似 

分 类 号：O512[理学—低温物理]