In the 2D Heisenberg model, the variance of topological charge inside a region scales with area at high temperature and with perimeter at low temperature, derived from series expansions.
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Fluctuations of topological charges in two-dimensional classical Heisenberg model through high-temperature and low-temperature expansions
In the 2D Heisenberg model, the variance of topological charge inside a region scales with area at high temperature and with perimeter at low temperature, derived from series expansions.