Energy exponents and corrections to scaling in Ising spin glasses

Abstract

We study the probability distribution P(E) of the ground state energy E in various Ising spin glasses. In most models, P(E) seems to become Gaussian with a variance growing as the system's volume V. Exceptions include the Sherrington-Kirkpatrick model (where the variance grows more slowly, perhaps as the square root of the volume), and mean field diluted spin glasses having +/-J couplings. We also find that the corrections to the extensive part of the disorder averaged energy grow as a power of the system size; for finite dimensional lattices, this exponent is equal, within numerical precision, to the domain-wall exponent theta_DW. We also show how a systematic expansion of theta_DW in powers of exp(-d) can be obtained for Migdal-Kadanoff lattices. Some physical arguments are given to rationalize our findings.

12 pages, RevTex, 9 figures

References in corpus (4)

• Scalings of domain wall energies in two dimensional Ising spin glasses
• Interface energies in Ising spin glasses
• Numerical Results for Ground States of Spin Glasses on Bethe Lattices
• Free energy fluctuations in Ising spin glasses

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