Journal Article

Analytical estimates of the locations of phase transition points in the ground state for the bimodal Ising spin glass model in two dimensions

Chiaki Yamaguchi

in Progress of Theoretical and Experimental Physics

Published on behalf of The Physical Society of Japan

Volume 2014, issue 5
Published online May 2014 | e-ISSN: 2050-3911 | DOI: https://dx.doi.org/10.1093/ptep/ptu058

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We analytically estimate the locations of phase transition points in the ground state for the [math] random bond Ising model with asymmetric bond distributions on the square lattice. We propose and study the percolation transitions for two types of bond shared by two non-frustrated plaquettes. The present method indirectly treats the sizes of clusters of correlated spins for the ferromagnetic and spin glass orders. We find two transition points. The first transition point is the phase transition point for the ferromagnetic order, and the location is obtained as [math] as the solution of [math]. The second transition point is the phase transition point for the spin glass order, and the location is obtained as [math]. Here, [math] is the ferromagnetic bond concentration, and [math] is the antiferromagnetic bond concentration. The obtained locations are very reasonably close to the previously estimated locations. This study suggests the presence of an intermediate phase between [math] and [math]; however, since the present method produces remarkable values but has no mathematical proof for accuracy yet, no conclusions are drawn in this article about the presence of the intermediate phase.

Keywords: A41

Journal Article.  4382 words.  Illustrated.

Subjects: Classical Mechanics

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