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Paper   IPM / Physic / 6553
School of Physics
  Title:   A Modified Quantum Renormalization Group for XXZ Chain
1.  V. Karimipour
2.  A. Langari
  Status:   Published
  Journal: Int. J. Mod. Phys. B
  No.:  19
  Vol.:  12
  Year:  1998
  Pages:   2359-2370
  Supported by:  IPM
A simple modification of the standard Renormalization Group (RG) technique for the study of quantum spin systems is introduced. By applying this method to the xxz spin [1/2] Heisenberg chain, we obtain the ground state energy with much higher accuracy than the standard RG.

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