| Order-Parameter Correlation Functions in Quantum Critical Phenomena (2007) | |||||||||
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. Comment: 4 pages, 4 figures | |||||||||
Details der Publikation | |||||||||
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