Mean Field Renormalization Group for the Boundary Magnetization of Strip Clusters

Details Mean Field Renormalization Group for the Boundary Magnetization of Strip Clusters Mean Field Renormalization Group for the Boundary Magnetization of Strip Clusters

1993-07-13

arxiv.org/abs/cond-mat/9307023v1

Physics

Condensed Matter

16 pages (plain TeX) + 8 figures (PostScript, appended), POLFIS-TH.XX/93

Scientific paper

10.1088/0305-4470/26/23/022

We analyze in some detail a recently proposed transfer matrix mean field approximation which yields the exact critical point for several two dimensional nearest neighbor Ising models. For the square lattice model we show explicitly that this approximation yields not only the exact critical point, but also the exact boundary magnetization of a semi--infinite Ising model, independent of the size of the strips used. Then we develop a new mean field renormalization group strategy based on this approximation and make connections with finite size scaling. Applying our strategy to the quadratic Ising and three--state Potts models we obtain results for the critical exponents which are in excellent agreement with the exact ones. In this way we also clarify some advantages and limitations of the mean field renormalization group approach.

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