Emergence of a non trivial fluctuating phase in the XY model on regular networks

Sarah de Nigris (1, 2) , Xavier Leoncini (2)

1 CPT - E5 Physique statistique et systèmes complexes
2 CPT - Centre de Physique Théorique - UMR 7332

We study an XY-rotor model on regular one dimensional lattices by varying the number of neighbours. The parameter $2\ge\gamma\ge1$ is defined. $\gamma=2$ corresponds to mean field and $\gamma=1$ to nearest neighbours coupling. We find that for $\gamma<1.5$ the system does not exhibit a phase transition, while for $\gamma > 1.5$ the mean field second order transition is recovered. For the critical value $\gamma=\gamma_c=1.5$, the systems can be in a non trivial fluctuating phase for whichthe magnetisation shows important fluctuations in a given temperature range, implying an infinite susceptibility. For all values of $\gamma$ the magnetisation is computed analytically in the low temperatures range and the magnetised versus non-magnetised state which depends on the value of $\gamma$ is recovered, confirming the critical value $\gamma_{c}=1.5$.

Mots clés: XY model; regular network; hamiltonian chaos; statistical mechanics; spin models

Domaines: Mécanique statistique [cond-mat.stat-mech]

Sarah de Nigris, Xavier Leoncini. Emergence of a non trivial fluctuating phase in the XY model on regular networks. EPL - Europhysics Letters, 2013, 101, pp.10002. ⟨10.1209/0295-5075/101/10002⟩. ⟨hal-00721437v3⟩