Plaquette valence bond solid in the frustrated Heisenberg quantum antiferromagnet on the square lattice
arXiv:cond-mat/0606776 · doi:10.1103/PhysRevB.74.144422
Abstract
Using both exact diagonalizations and diagonalizations in a subset of short-range valence bond singlets, we address the nature of the groundstate of the Heisenberg spin-1/2 antiferromagnet on the square lattice with competing next-nearest and next-next-nearest neighbor antiferromagnetic couplings (J1-J2-J3 model). A detailed comparison of the two approaches reveals a region along the line (J2+J3)/J1=1/2, where the description in terms of nearest-neighbor singlet coverings is excellent, therefore providing evidence for a magnetically disordered region. Furthermore a careful analysis of dimer-dimer correlation functions, dimer structure factors and plaquette-plaquette correlation functions provides striking evidence for the presence of a plaquette valence bond solid order in part of the magnetically disordered region.
11 pages, 17 figures To appear in Phys. Rev. B
References in corpus (4)
Cited by in corpus (31)
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