Fidelity approach to the disordered quantum XY model
Quantum Physics
2009-02-05 v3 Strongly Correlated Electrons
Abstract
We study the random XY spin chain in a transverse field by analyzing the susceptibility of the ground state fidelity, numerically evaluated through a standard mapping of the model onto quasi-free fermions. It is found that the fidelity susceptibility and its scaling properties provide useful information about the phase diagram. In particular it is possible to determine the Ising critical line and the Griffiths phase regions, in agreement with previous analytical and numerical results.
Cite
@article{arxiv.0808.4140,
title = {Fidelity approach to the disordered quantum XY model},
author = {Silvano Garnerone and N. Tobias Jacobson and Stephan Haas and Paolo Zanardi},
journal= {arXiv preprint arXiv:0808.4140},
year = {2009}
}
Comments
4 pages, 3 figures; references added