Two-parameter scaling of correlation functions near continuous phase transitions

Details Two-parameter scaling of correlation functions near continuous phase transitions Two-parameter scaling of correlation functions near continuous phase transitions

2007-05-31

arxiv.org/abs/0705.4462v3

Phys. Rev. E 76, 040101(R) (2007)

Physics

Condensed Matter

Statistical Mechanics

4 pages, 5 figures, revised version, to appear as Rapid Communication in Phys.Rev.E

Scientific paper

10.1103/PhysRevE.76.040101

We discuss the order parameter correlation function in the vicinity of continuous phase transitions using a two-parameter scaling form G(k) = k_c^{-2} g(k\xi,k/k_c), where k is the wave-vector, \xi is the correlation length, and the interaction-dependent non-universal momentum scale k_c remains finite at the critical fixed point. The correlation function describes the entire critical regime and captures the classical to critical crossover. One-parameter scaling is recovered only in the limit k/k_c->0. We present an approximate calculation of g(x,y) for the Ising universality class using the functional renormalization group.

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