Order-Parameter Correlation Functions in Quantum Critical Phenomena

2007/07/03 by Min-Chul Cha, Gerardo Ortiz, Cha, Min-Chul +2
Physics and Astronomy · #Physics of Superconductivity and Magnetism #Quantum, superfluid, helium dynamics #Spectroscopy and Quantum Chemical Studies #cond-mat.stat-mech #cond-mat.str-el

paper · pdf · doi:10.48550/arxiv.0707.0509

4 pages, 4 figures

arxiv created 2007/07/03 · arxiv updated 2009/12/01

Abstract

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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