The spin functional renormalization group, closed with a Ward identity, yields the magnetic equation of state and magnon damping of a 2D Heisenberg ferromagnet, matching Monte Carlo at low temperatures for finite fields.
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Spin functional renormalization group for quantum Heisenberg ferromagnets: Magnetization and magnon damping in two dimensions
The spin functional renormalization group, closed with a Ward identity, yields the magnetic equation of state and magnon damping of a 2D Heisenberg ferromagnet, matching Monte Carlo at low temperatures for finite fields.