Low energy effective Hamiltonian for the XXZ spin chain
نویسندگان
چکیده
منابع مشابه
Space group symmetry, spin-orbit coupling and the low energy effective Hamiltonian for iron based superconductors
We construct the symmetry adapted low energy effective Hamiltonian for the electronic states in the vicinity of the Fermi level in iron based superconductors. We use Luttinger’s method of invariants, expanding about Γ and M points in the Brillouin zone corresponding to two iron unit cell, and then matching the coefficients of the expansion to the 5and 8-band models. We then use the method of in...
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A simple modification of the standard Renormalization Group (RG) technique for the study of quantum spin systems is introduced. Our method which takes into account the effect of boundary conditions by employing the concept of superblock, may be regarded as a simple way for obtaining first estimates of many properties of spin systems. By applying this method to the xxz spin 1 2 Heisenberg chain,...
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ژورنال
عنوان ژورنال: Nuclear Physics B
سال: 1998
ISSN: 0550-3213
DOI: 10.1016/s0550-3213(98)00249-1