%0 Journal Article
%T Topological phase transition in 2D quantum Josephson array
%A A. I. Belousov
%A Yu. E. Lozovik
%J Physics
%D 1998
%I arXiv
%R 10.1016/0038-1098(96)00424-3
%X Path Integral Quantum Monte Carlo simulation is used to study thermodynamic properties and a phase diagram of 2D quantum Josephson array, described by 2+1 XY model. The helicity and vorticity moduli, correlation function of phases and other characteristics of the system as functions of quantum parameter $q$ and temperature $T$ are studied ($q=2e/\sqrt{JC_0}$, $J$ is the Josephson coupling constant, $C_0$ is the intragrain capacitance). Quantum fluctuation induced superconductor - normal phase transition is studied in detail through the use of behavior of above-mentioned quantities. No discontinuous or reentrant phase transition in $q-T$ plane is found. Analysis of the vorticity and the renormalized coupling constant leads to the conclusion that the whole line of phase transition is of Kosterlitz - Thouless type.
%U http://arxiv.org/abs/cond-mat/9803300v1