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Random field Ising model on networks with inhomogeneous connections
Department of Physics, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Korea.
2006 (English)In: Physical Review E. Statistical, Nonlinear, and Soft Matter Physics, ISSN 1063-651X, E-ISSN 1095-3787, Vol. 74, no 031118Article in journal (Refereed) Published
Abstract [en]

We study a zero-temperature phase transition in the random field Ising model on scale-free networks with the degree exponent γ. Using an analytic mean-field theory, we find that the spins are always in the ordered phase for γ<3. On the other hand, the spins undergo a phase transition from an ordered phase to a disordered phase as the dispersion of the random fields increases for γ>3. The phase transition may be either continuous or discontinuous depending on the shape of the random field distribution. We derive the condition for the nature of the phase transition. Numerical simulations are performed to confirm the results.

Place, publisher, year, edition, pages
2006. Vol. 74, no 031118
URN: urn:nbn:se:umu:diva-37768DOI: 10.1103/PhysRevE.74.031118OAI: diva2:369929
Available from: 2010-11-12 Created: 2010-11-12 Last updated: 2010-11-12Bibliographically approved

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Lee, Sang Hoon
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Physical Review E. Statistical, Nonlinear, and Soft Matter Physics

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