Superfluid density of two-dimensional weakly interacting boson system at zero temperature |
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Authors: | PeiSong He YuWei Fan |
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Institution: | 1.School of Physics,Peking University,Beijing,China;2.Yuanpei College,Peking University,Beijing,China |
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Abstract: | 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. |
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Keywords: | superfluid density one-loop fluctuations weakly interacting |
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