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Simulations of pure and doped low-dimensional spin-1/2 gapped systems

  • Nicolas Laflorencie
  • Didier Poilblanc
Chapter
Part of the Lecture Notes in Physics book series (LNP, volume 645)

Abstract

Low dimensional spin-1/2 systems with antiferromagnetic interactions display very innovative features, driven by strong quantum fluctuations. In particular, geometrical effects or competing magnetic interactions can give rise to the formation of a spin gap between the singlet ground state and the first excited triplet state. In this chapter, we focus on the numerical investigation of such systems by Exact Diagonalisation methods and some extensions of it including a simultaneous mean-field treatment of some perturbative couplings. After a presentation of the Lanczos algorithm and a description of the space group symmetries, we give a short review on some pure low-dimensional frustrated spin gapped systems. In particular, we outline the role of the magnetic frustration in the formation of disordered phase. A large part is also devoted to frustrated Spin-Peierls systems for which the role of interchain couplings as well as impurity doping effects has been studied numerically.

Keywords

Near Neighbor Heisenberg Model Gapped System Space Group Symmetry Lanczos Algorithm 
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Copyright information

© Springer-Verlag 2004

Authors and Affiliations

  • Nicolas Laflorencie
    • 1
  • Didier Poilblanc
    • 1
  1. 1.Laboratoire de Physique ThéoriqueCNRS-UMR5152 Université Paul SabatierToulouseFrance

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