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

TL;DR

This paper investigates the XY model on regular networks, revealing a non-trivial fluctuating phase at a critical connectivity, with phase transition behavior depending on the number of neighbors.

Contribution

It identifies a critical network connectivity at $ ext{γ}_c=1.5$ where a non-trivial fluctuating phase emerges, bridging mean field and local interaction regimes.

Findings

No phase transition for $ ext{γ}<1.5$

Mean field second order transition for $ ext{γ}>1.5$

Existence of a fluctuating phase at $ ext{γ}= ext{γ}_c=1.5$

Abstract

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 $\gamma_{c}=1.5$.