Comment on "Quantum Monte Carlo scheme for frustrated Heisenberg antiferromagnets"

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dc.creatorBeach, K. S. D.
dc.creatorMambrini, Matthieu
dc.creatorAlet, Fabien
dc.date2008-01-29
dc.date.accessioned2026-07-07T09:38:57Z
dc.date.available2026-07-07T09:38:57Z
dc.descriptionQuantum Monte Carlo methods are sophisticated numerical techniques for simulating interacting quantum systems. In some cases, however, they suffer from the notorious "sign problem" and become too inefficient to be useful. A recent publication [J. Wojtkiewicz, Phys. Rev. B 75, 174421 (2007)] claims to have solved the sign problem for a certain class of frustrated quantum spin systems through the use of a bipartite valence bond basis. We show in this Comment that the apparent positivity of the path integral is due to a misconception about the resolution of the identity operator in this basis, and that consequently the sign problem remains a severe obstacle for the simulation of frustrated quantum magnets.
dc.description2 pages
dc.identifierhttps://arxiv.org/abs/0801.4498
dc.identifierhttp://arxiv.org/abs/0801.4498
dc.identifierPhys. Rev. B 77, 146401 (2008)
dc.identifierdoi:10.1103/PhysRevB.77.146401
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/160998
dc.subjectStrongly Correlated Electrons
dc.subjectStatistical Mechanics
dc.titleComment on "Quantum Monte Carlo scheme for frustrated Heisenberg antiferromagnets"
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