Genuine correlations in finite-size spin systems
Quantum Physics
2015-06-05 v1 Statistical Mechanics
Abstract
Genuine multipartite correlations in finite-size XY chains are studied as a function of the applied external magnetic field. We find that, for low temperatures, multipartite correlations are sensitive to the parity change in the Hamiltonian ground state, given that they exhibit a minimum every time that the ground state becomes degenerate. This implies that they can be used to detect the factorizing point, that is, the value of the external field such that, in the termodynamical limit, the ground state becomes the tensor product of single-spin states.
Cite
@article{arxiv.1206.1726,
title = {Genuine correlations in finite-size spin systems},
author = {Gian Luca Giorgi and Thomas Busch},
journal= {arXiv preprint arXiv:1206.1726},
year = {2015}
}
Comments
Submitted to Int. J. Mod. Phys. B, special issue "Classical Vs Quantum correlations in composite systems" edited by L. Amico, S. Bose, V. Korepin and V. Vedral