Application of a constrained-transfer-matrix method to metastability in the $d$$=$$2$ Ising ferromagnet

Details Application of a constrained-transfer-matrix method to metastability in the $d$$=$$2$ Ising ferromagnet Application of a constrained-transfer-matrix method to metastability in the $d$$=$$2$ Ising ferromagnet

1994-06-28

arxiv.org/abs/cond-mat/9406114v2

Physica A 212 (1994) 194

Physics

Condensed Matter

27 pages (figure captions added), 15 figures available upon request, Latex, FSU-SCRI-94-58, submitted to Physica A

Scientific paper

10.1016/0378-4371(94)90147-3

Applying a numerical transfer-matrix formalism, we obtain complex-valued constrained free energies for the two-dimensional square-lattice nearest-neighbor Ising ferromagnet below its critical temperature and in an external magnetic field. In particular, we study the imaginary part of the constrained free-energy branch that corresponds to the metastable phase. Although droplets are not introduced explicitly, the metastable free energy is obtained in excellent agreement with field-theoretical droplet-model predictions. The finite-size scaling properties are different in the weak-field and intermediate-field regimes, and we identify the corresponding different critical-droplet shapes. For intermediate fields, we show that the surface free energy of the critical droplet is given by a Wulff construction with the equilibrium surface tension. We also find a prefactor exponent in complete agreement with the field-theoretical droplet model. Our results extend the region of validity for known results of this field-theoretical droplet model, and they indicate that this transfer-matrix approach provides a nonperturbative numerical continuation of the equilibrium free energy into the metastable phase.

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