Numerical study of the TAP equations for infinite-range spin glass models

Terufumi Yokota

Physica A: Statistical Mechanics and its Applications, 1992, vol. 185, issue 1, 336-339

Abstract: The nature of spin glass phase for infinite-range model is investigated by an approach without relying on the replica method. Mean field equations are solved numerically and order parameters such as q(x) are obtained. First, to study a kind of quantum effects, the SK model in a transverse field is investigated within the pair approximation. The nature of the spin glass phase is shown to be unchanged by the presence of a transverse field. Secondly, a generalized SK model with a crystal field is studied to clarify the nature of the first order transition. The first order spin glass transition is described consistently. The distribution of pi = 〈S2i〉 is doubly peaked in the spin glass phase on the first order transition line.

Date: 1992
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:185:y:1992:i:1:p:336-339

DOI: 10.1016/0378-4371(92)90473-4

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