Correlation inequalities for the quantum XY model

Abstract

We show the positivity or negativity of truncated correlation functions in the quantum XY model with spin 1/2 (at any temperature) and spin 1 (in the ground state). These Griffiths-Ginibre inequalities of the second kind generalise an earlier result of Gallavotti.

9 pages

References in corpus (1)

• Some Properties of Correlations of Quantum Lattice Systems in Thermal Equilibrium

Cited by in corpus (2)

• Phase transition for loop representations of Quantum spin systems on trees
• Correlation inequalities for classical and quantum XY models