Publication: Cluster Monte Carlo Algorithm for the Quantum Rotor Model

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Title	Cluster Monte Carlo Algorithm for the Quantum Rotor Model
Authors/Editors*	F. Alet, E. S. Sorensen
Where published*	Physical Review E Rapid Communications, vol 67, 015701 (2003)
How published*	None
Year*	2003
Volume	0
Number	0
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Abstract	We propose a highly efficient ``worm" like cluster Monte Carlo algorithm for the quantum rotor model in the link-current representation. We explicitly prove detailed balance for the new algorithm even in the presence of disorder. For the pure quantum rotor model with $mu=0$ the new algorithm yields high precision estimates for the critical point $K_c=0.33305(5)$ and the correlation length exponent $nu=0.670(3)$. For the disordered case, $mu=frac{1}{2}pmfrac{1}{2}$, we find $nu=1.15(10)$.