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Paper   IPM / Physic / 11306
School of Physics
  Title:   Factorized Ground State for A General Class of Ferrimagnets
  Author(s): 
1.  M. Rezai
2.  A. Langari
3.  J. Abouie
  Status:   Published
  Journal: Phys. Rev. B
  Vol.:  81
  Year:  2010
  Pages:   060401 (Rapid Communication)
  Supported by:  IPM
  Abstract:
We have found the exact (factorized) ground state of a general class of ferrimagnets in the presence of a magnetic field which includes the anisotropic and long-range interactions for arbitrary dimensional space. In particular cases our model represents many spin chains with bond alternation of antiferromagnetic-ferromagnetic coupling, ferrimagnetic spin ladders, and also homogeneous spin-s models. The factorized ground state is a product of single-particle kets on a bipartite lattice composed of two different spins ( #961;, #963;) which is characterized by two angles, a biangle state. The spin-wave analysis around the exact ground state shows two branch of excitations which are the origin of two dynamics of the model. The signature of these dynamics is addressed as a peak and a broaden bump in the specific heat.

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