A Modified Quantum Renormalization Group for XXZ Spin Chain
نویسندگان
چکیده
منابع مشابه
A Modified Quantum Renormalization Group for xxz Spin Chain
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,...
متن کاملModified Quantum Renormalization Group for xxz spin chain
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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Two discrete path integral formulations for the ground state of a spinpinned quantum anisotropic XXZ Heisenberg chain are introduced. Their properties are discussed and two recursion relations are proved. Departamento de Fisica-Matematica, Universidade de Sao Paulo, Sao Paulo 05315-970 Brazil Dipartimento di Matematica, Università di Bologna, 40127 Bologna, Italy Department of Mathematics, Univ...
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We compute, by means of exact diagonalization of systems of N = 16 and 18 spins, the correlation function < σz 0σ z n > at nonzero temperature for the XXZ model with anisotropy ∆. In the gapless ferromagnetic region −1 < ∆ < 0 for fixed separation the temperature can always be made sufficiently low so that the correlation is always negative. However we find that for sufficiently large temperatu...
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ژورنال
عنوان ژورنال: International Journal of Modern Physics B
سال: 1998
ISSN: 0217-9792,1793-6578
DOI: 10.1142/s021797929800137x