Radial Fredholm perturbation in the two-dimensional Ising model and gap-exponent relation

Details Radial Fredholm perturbation in the two-dimensional Ising model and gap-exponent relation Radial Fredholm perturbation in the two-dimensional Ising model and gap-exponent relation

1995-05-24

arxiv.org/abs/cond-mat/9505111v1

J. Phys. A28 (1995) 3925-3934

Physics

Condensed Matter

12 pages, TeX file + 4 figures, epsf needed

Scientific paper

10.1088/0305-4470/28/14/013

We consider concentric circular defects in the two-dimensional Ising model, which are distributed according to a generalized Fredholm sequence, i. e. at exponentially increasing radii. This type of aperiodicity does not change the bulk critical behaviour but introduces a marginal extended perturbation. The critical exponent of the local magnetization is obtained through finite-size scaling, using a corner transfer matrix approach in the extreme anisotropic limit. It varies continuously with the amplitude of the modulation and is closely related to the magnetic exponent of the radial Hilhorst-van Leeuwen model. Through a conformal mapping of the system onto a strip, the gap-exponent relation is shown to remain valid for such an aperiodic defect.

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