Equilibrium properties of disordered spin models with two-scale interactions.
Equilibrium properties of disordered spin models with two-scale interactions.
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具有两尺度相互作用的无序自旋模型的平衡特性。
DOI:
10.1103/physreve.80.031138
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发表时间:
2009
期刊:
影响因子:
--
通讯作者:
Raymond J
中科院分区:
文献类型:
--
作者:
Raymond J
Methods for understanding classical disordered spin systems with interactions conforming to some idealized graphical structure are well developed. The equilibrium properties of the Sherrington-Kirkpatrick model, which has a densely connected structure, have become well understood. Many features generalize to sparse Erdös-Rényi graph structures above the percolation threshold and to Bethe lattices when appropriate boundary conditions apply. In this paper, we consider spin states subject to a combination of sparse strong interactions with weak dense interactions, which we term a composite model. The equilibrium properties are examined through the replica method, with exact analysis of the high-temperature paramagnetic, spin-glass, and ferromagnetic phases by perturbative schemes. We present results of replica symmetric variational approximations, where perturbative approaches fail at lower temperature. Results demonstrate re-entrant behaviors from spin glass to ferromagnetic phases as temperature is lowered, including transitions from replica symmetry broken to replica symmetric phases. The nature of high-temperature transitions is found to be sensitive to the connectivity profile in the sparse subgraph, with regular connectivity a discontinuous transition from the paramagnetic to ferromagnetic phases is apparent.
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DOI:
10.1088/1742-5468/2009/05/p05015
发表时间:
2008
期刊:
Journal of Statistical Mechanics: Theory and Experiment
影响因子:
--
作者:
Jack Raymond;D. Saad
通讯作者:
D. Saad
DOI:
10.1088/1751-8113/41/32/324014
发表时间:
2008
期刊:
Mathematical and Theoretical
影响因子:
--
作者:
Raymond J
通讯作者:
Raymond J
DOI:
--
发表时间:
1987
期刊:
影响因子:
--
作者:
P. Mottishaw;C. Dominicis
通讯作者:
C. Dominicis
DOI:
--
发表时间:
2003
期刊:
影响因子:
--
作者:
H. Czyz;A. Grzelińska;Johann H. Kühn;Germán Rodrigo
通讯作者:
Germán Rodrigo
DOI:
10.1103/physreve.78.021107
发表时间:
2008
期刊:
Physical review. E, Statistical, nonlinear, and soft matter physics
影响因子:
--
作者:
Mallard E
通讯作者:
Mallard E