Local critical behaviour at aperiodic surface extended perturbation in the Ising quantum chain

Details Local critical behaviour at aperiodic surface extended perturbation in the Ising quantum chain Local critical behaviour at aperiodic surface extended perturbation in the Ising quantum chain

1994-11-07

arxiv.org/abs/cond-mat/9411030v2

J. Phys. A 28 (1995) 45-55

Physics

Condensed Matter

13 pages, TeX file + 6 figures, epsf needed

Scientific paper

10.1088/0305-4470/28/1/011

The surface critical behaviour of the semi--infinite one--dimensional quantum Ising model in a transverse field is studied in the presence of an aperiodic surface extended modulation. The perturbed couplings are distributed according to a generalized Fredholm sequence, leading to a marginal perturbation and varying surface exponents. The surface magnetic exponents are calculated exactly whereas the expression of the surface energy density exponent is conjectured from a finite--size scaling study. The system displays surface order at the bulk critical point, above a critical value of the modulation amplitude. It may be considered as a discrete realization of the Hilhorst--van Leeuwen model.

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