Random field Ising model on networks with inhomogeneous connections

Details Random field Ising model on networks with inhomogeneous connections Random field Ising model on networks with inhomogeneous connections

2006-06-07

arxiv.org/abs/cond-mat/0606179v2

Phys. Rev. E 74, 031118 (2006)

Physics

Condensed Matter

Statistical Mechanics

7 pages, 7 figures

Scientific paper

10.1103/PhysRevE.74.031118

We study a zero-temperature phase transition in the random field Ising model on scale-free networks with the degree exponent $\gamma$. Using an analytic mean-field theory, we find that the spins are always in the ordered phase for $\gamma<3$. 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 $\gamma > 3$. 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.

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