Correlation Inequalities for the Quantum XY Model
@article{Benassi2016CorrelationIF, title={Correlation Inequalities for the Quantum XY Model}, author={Costanza Benassi and Benjamin Lees and Daniel Ueltschi}, journal={Journal of Statistical Physics}, year={2016}, volume={164}, pages={1157 - 1166} }
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.
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