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Plaquette valence bond solid in the frustrated Heisenberg quantum antiferromagnet on the square lattice | | M. Mambrini
; A. Laeuchli
; D. Poilblanc
; F. Mila
; | | Date: |
29 Jun 2006 | | Subject: | Strongly Correlated Electrons | | 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. | | Source: | arXiv, cond-mat/0606776 | | Services: | Forum | Review | PDF | Favorites | |
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