Spin Gap in Two-Dimensional Heisenberg Model for CaV$_4$O$_9$

Nobuyuki Katoh; Masatoshi Imada

doi:10.1143/JPSJ.64.4105

Spin Gap in Two-Dimensional Heisenberg Model for CaV$_4$O$_9$

Condensed Matter 2009-10-28 v1

Authors: Nobuyuki Katoh , Masatoshi Imada

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Abstract

We investigate the mechanism of spin gap formation in a two-dimensional model relevant to Mott insulators such as CaV $_4$ O $_9$ . From the perturbation expansion and quantum Monte Carlo calculations, the origin of the spin gap is ascribed to the four-site plaquette singlet in contrast to the dimer gap established in the generalized dimerized Heisenberg model.

Keywords

spin gap two-dimensional Heisenberg model CaV4O9 plaquette singlet quantum Monte Carlo Mott insulator

Cite

@article{arxiv.cond-mat/9510049,
  title  = {Spin Gap in Two-Dimensional Heisenberg Model for CaV$_4$O$_9$},
  author = {Nobuyuki Katoh and Masatoshi Imada},
  journal= {arXiv preprint arXiv:cond-mat/9510049},
  year   = {2009}
}