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Paper   IPM / Physic / 6650
School of Physics
  Title:   Quantum Renormalization Group for the XXZ Model in the Presence of An External Magnetic Field
  Author(s):  A. Langari
  Status:   Published
  Journal: Phys. Lett. A
  No.:  52
  Vol.:  246
  Year:  1998
  Pages:   359-366
  Supported by:  IPM
The anisotropic s=[1/2] antiferromagnetic Heisenberg chain in the presence of an external magnetic field is studied by using the standard quantum renormalization group. The critical line of the transition from partially magnetized (PM) phase to the saturated ferromagnetic (SFM) phase is obtained with a very good agreement with the known exact results. The critical exponents, ground state energy, magnetization curve and correlation functions are also calculated. Our results show that the standard RG approach, yields fairly good values for the critical points and their exponents.

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