Nonlinear Sigma model method for the J1-J2 Heisenberg model: disordered ground state with plaquette symmetry

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dc.creatorTakano, Ken'ichi
dc.creatorKito, Yoshiya
dc.creatorOno, Yoshiaki
dc.creatorSano, Kazuhiro
dc.date2003-06-25
dc.date2003-10-29
dc.date.accessioned2026-07-07T02:52:02Z
dc.date.available2026-07-07T02:52:02Z
dc.descriptionA novel nonlinear sigma model method is proposed for the two-dimensional J1-J2 model, which is extended to include plaquette-type distortion. The nonlinear sigma model is properly derived without spoiling the original spin degrees of freedom. The method shows that a single disordered phase continuously extends from a frustrated uniform regime to an unfrustrated distorted regime. By the continuity and Oshikawa's commensurability condition, the disordered ground states for the uniform J1-J2 model are plaquette states with four-fold degeneracy.
dc.description4 pages (including 2 figures)
dc.identifierhttps://arxiv.org/abs/cond-mat/0306632
dc.identifierhttp://arxiv.org/abs/cond-mat/0306632
dc.identifierPhys.Rev.Lett. 91 (2003) 197202
dc.identifierdoi:10.1103/PhysRevLett.91.197202
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/21691
dc.subjectStrongly Correlated Electrons
dc.subjectStatistical Mechanics
dc.subjectHigh Energy Physics - Theory
dc.titleNonlinear Sigma model method for the J1-J2 Heisenberg model: disordered ground state with plaquette symmetry
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