XYmodel and the superfluid density in two dimensions
作者： Takao Ohta , David Jasnow
关键词: Classical XY model 、 Physics 、 Spin wave 、 Momentum 、 Superfluidity 、 State (functional analysis) 、 Shell (structure) 、 Quantum mechanics 、 Twist 、 Recursion (computer science) 、 Mathematical physics
摘要: By computing the incremental free energy of two-dimensional XY model in a state with long-wavelength twist local short-range order, we evaluate for all T .. T/sub c/-, rho/sub s//T becomes universal and recover previous results Nelson Kosterlitz. In Appendix derive Kosterlitz recursion relations by transforming to sine-Gordon system using conventional momentum shell integration techniques.
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