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Exact determination of all ground states of random field systems in polynomial time

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  • Hartmann, A.K.
  • Usadel, K.D.

Abstract

An algorithm is developed which allows calculating all ground states of ferromagnetic and unfrustrated antiferromagnetic Ising systems with arbitrary site-dependent fields by transforming the system into an equivalent network and calculating the maximal flow. By a trial and error scheme a minimum cut is constructed which corresponds to a spin configuration. In this way each ground state is calculated with a finite probability. The algorithm is applied to site-diluted antiferromagnets in external magnetic fields. It is found that in this case its time complexity is approximately quadratic in the lattice size. As an application we calculate the distribution of overlaps between ground states of the site-diluted antiferromagnet in a strong magnetic field and we analyse the fractal structure of these ground states.

Suggested Citation

  • Hartmann, A.K. & Usadel, K.D., 1995. "Exact determination of all ground states of random field systems in polynomial time," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 214(2), pages 141-152.
    • Handle: RePEc:eee:phsmap:v:214:y:1995:i:2:p:141-152
    DOI: 10.1016/0378-4371(94)00259-V
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    References listed on IDEAS

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    1. Aharony, Joseph, 1979. "Time Effects in Empirical Stock Valuation Models," The Review of Economics and Statistics, MIT Press, vol. 61(3), pages 460-466, August.
    2. L. R. Ford, Jr. & D. R. Fulkerson, 1956. "Solving the Transportation Problem," Management Science, INFORMS, vol. 3(1), pages 24-32, October.
    3. Nowak, U & Usadel, K.D, 1992. "Correlations and fractality in random Ising magnets," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 191(1), pages 203-207.
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    1. Hartmann, Alexander K., 1998. "Ground-state structure of diluted antiferromagnets and random field systems," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 248(1), pages 1-20.
    2. Hartmann, Alexander K., 1996. "Cluster-exact approximation of spin glass groundstates," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 224(3), pages 480-488.

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