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Topological phase transition of a fractal spin system: The relevance of the network complexity
13.A. Wipf, in Statistical Approach to Quantum Field Theory, Lectures Notes in Physics Vol. 100 (Springer Berlin Heidelberg, 2013), pp. 101–118.
14.L. D. Landau and E. M. Lifshitz, in Statistical Physics (Pergamon Press, 1958).
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A new type of collective excitations, due to the topology of a complex random network that can be characterized by a fractal dimension DF, is investigated. We show analytically that these excitations generate phase transitions due to the non-periodic topology of the DF > 1 complex network. An Ising system, with long range interactions, is studied in detail to support the claim. The analytic treatment is possible because the evaluation of the partition function can be decomposed into closed factor loops, in spite of the architectural complexity. The removal of the infrared divergences leads to an unconventional phase transition, with spin correlations that are robust against thermal fluctuations.
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