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A dedicated algorithm for calculating ground states for the triangular random bond Ising model
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DOI：10.1016/j.cpc.2010.10.030.png)
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摘要
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In the presented article we present an algorithm for the computation of ground state spin configurations for the 2d random bond Ising model on planar triangular lattice graphs. Therefore, it is explained how the respective ground state problem can be mapped to an auxiliary minimum-weight perfect matching problem, solvable in polynomial time. Consequently, the ground state properties as well as minimum-energy domain wall (MEDW) excitations for very large 2d systems, e.g. lattice graphs with up to N = 384 x 384 spins, can be analyzed very fast. Here, we investigate the critical behavior of the corresponding T = 0 ferromagnet to spin-glass transition, signaled by a breakdown of the magnetization, using finite-size scaling analyses of the magnetization and MEOW excitation energy and we contrast our numerical results with previous simulations and presumably exact results. (C) 2010 Elsevier B.V. All rights reserved.
Keyword:
Random bond Ising model
Negative-weight percolation
Groundstate phase transitions
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期刊
IF:
3.4
论文数:
1.2W
被引数:
3.7W
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Application of exact combinatorial optimization algorithms to the physics of disordered systems
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