Critical Behavior of Hierarchical Ising Models

Abstract

We consider the critical behavior of two-dimensional layered Ising models where the exchange couplings between neighboring layers follow hierarchical sequences. The perturbation caused by the non-periodicity could be irrelevant, relevant or marginal. For marginal sequences we have performed a detailed study, which involved analytical and numerical calculations of different surface and bulk critical quantities in the two-dimensional classical as well as in the one-dimensional quantum version of the model. The critical exponents are found to vary continuously with the strength of the modulation, while close to the critical point the system is essentially anisotropic: the correlation length is diverging with different exponents along and perpendicular to the layers.

21 pages, plain TeX, 3 figures available on request, to appear in Phys. Rev. B

References in corpus (3)

• Surface Magnetization and Critical Behavior of Aperiodic Ising Quantum Chains
• Surface Magnetization of Aperiodic Ising Systems: a Comparative Study of the Bond and Site Problems
• Anisotropic Scaling in Layered Aperiodic Ising Systems

Cited by in corpus (5)

• Exact Renormalization-Group Study of Aperiodic Ising Quantum Chains and Directed Walks
• Surface Magnetisation and Surface Correlations in Aperiodic Ising Models
• Aperiodic spin chain in the mean-field approximation
• Crossover between aperiodic and homogeneous semi-infinite critical behaviors in multilayered two-dimensional Ising models
• Interface Fluctuations on a Hierarchical Lattice