The critical Casimir force and its fluctuations in lattice spin models: exact and Monte Carlo results

Abstract

We present general arguments and construct a stress tensor operator for finite lattice spin models. The average value of this operator gives the Casimir force of the system close to the bulk critical temperature $T_c$. We verify our arguments via exact results for the force in the two-dimensional Ising model, $d$-dimensional Gaussian and mean spherical model with $2<d<4$. On the basis of these exact results and by Monte Carlo simulations for three-dimensional Ising, XY and Heisenberg models we demonstrate that the standard deviation of the Casimir force $F_C$ in a slab geometry confining a critical substance in-between is $k_{b}TD(T)(A/a^{d-1}{)}^{1/2}$, where $A$ is the surface area of the plates, $a$ is the lattice spacing and $D(T)$ is a slowly varying nonuniversal function of the temperature $T$. The numerical calculations demonstrate that at the critical temperature $T_c$ the force possesses a Gaussian distribution centered at the mean value of the force $<F_C>=k_b{T}_c(d-1)\Delta /(L/a{)}^d$, where $L$ is the distance between the plates and $\Delta$ is the (universal) Casimir amplitude.

21 pages, 7 figures, to appear in PRE

References in corpus (2)

• Fluctuations of Fluctuation-Induced "Casimir" Forces
• Cluster Hybrid Monte Carlo Simulation Algorithms

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