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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…
cond-mat.stat-mech2016
Staggered long-range order for diluted quantum spin models
Roman Kotecký, Benjamin Lees
We study an annealed site diluted quantum XY model with spin . We find regions of the parameter space where, in spite of being a priori favourable for a…