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- W2867177086 abstract "It is widely accepted that the free energy F(H) of the two-dimensional Ising model in the ferromagnetic phase T<T_c has an essential branch cut singularity at the origin H=0. The phenomenological droplet theory predicts that near the cut drawn along the negative real axis H<0, the imaginary part of the free energy per lattice site has the form Im F[exp (pm ipi |H|)] = pm B |H| exp (-A/|H|) for small |H|. We verify this prediction in analytical perturbative transfer matrix calculations for the square lattice Ising model for all temperatures 0<T<T_c and arbitrary anisotropy ratio J_1/J_2. We obtain an expression for the constant A which coincides exactly with the prediction of the droplet theory. For the amplitude B we obtain B =pi M/18, where M is the equilibrium spontaneous magnetization. In addition we find discrete-lattice corrections to the above mentioned phenomenological formula for ImF, which oscillate in H^{-1}." @default.
- W2867177086 created "2018-07-19" @default.
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- W2867177086 date "2000-08-02" @default.
- W2867177086 modified "2023-09-27" @default.
- W2867177086 title "Analytic transfer-matrix verification of the droplet picture in the anisotropic d=2 Ising model" @default.
- W2867177086 hasPublicationYear "2000" @default.
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