期刊
PHYSICAL REVIEW LETTERS
卷 84, 期 7, 页码 1503-1506出版社
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.84.1503
关键词
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The approach to equilibrium, from a nonequilibrium initial state, in a system at its critical point is usually described by a scaling theory with a single growing length scale, xi(t) similar to t(1/z), where z is the dynamic exponent that governs the equilibrium dynamics. We show that, for the 2D XY model, the rate of approach to equilibrium depends on the initial condition. In particular, xi(t) similar to t(1/2) if no free vortices are present in the initial state, while xi(t) similar to (t/lnt)(1/2) if free vortices are present.
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