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math-ph2016★ 10 cited
Decay of correlations in 2D quantum systems with continuous symmetry
Costanza Benassi, Juerg Froehlich, Daniel Ueltschi
We study a large class of models of two-dimensional quantum lattice systems with continuous symmetries, and we prove a general McBryan-Spencer-Koma-Tasaki theorem concerning algebr…
math-ph2016★ 6 cited
Correlation inequalities for classical and quantum XY models
Costanza Benassi, Benjamin Lees, Daniel Ueltschi
We review correlation inequalities of truncated functions for the classical and quantum XY models. A consequence is that the critical temperature of the XY model is necessarily sma…