Order-Parameter Correlation Functions in Quantum Critical Phenomena

Details Order-Parameter Correlation Functions in Quantum Critical Phenomena Order-Parameter Correlation Functions in Quantum Critical Phenomena

2007-07-03

arxiv.org/abs/0707.0509v1

Physics

Condensed Matter

Statistical Mechanics

4 pages, 4 figures

Scientific paper

We investigate the functional form of the order-parameter (two-point) correlation function in quantum critical phenomena. Contrary to the common lore, when there is no particle-hole symmetry we find that the equal-time correlation function at criticality does not display a diverging correlation length. We illustrate our conclusions by Monte Carlo calculations of the quantum rotor model in $d=2$ space dimensions

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