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28 March 2024
 
  » arxiv » cond-mat/0306632

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Nonlinear Sigma model method for the J1-J2 Heisenberg model: disordered ground state with plaquette symmetry
Ken’ichi Takano ; Yoshiya Kito ; Yoshiaki Ono ; Kazuhiro Sano ;
Date 25 Jun 2003
Journal Phys.Rev.Lett. 91 (2003) 197202 DOI: 10.1103/PhysRevLett.91.197202
Subject Strongly Correlated Electrons; Statistical Mechanics | cond-mat.str-el cond-mat.stat-mech hep-th
AbstractA 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.
Source arXiv, cond-mat/0306632
Other source [GID 783309] pmid14611608
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