Geodesic
Cluster perturbation theory for spin Hamiltonians
Teoretičeskaâ i matematičeskaâ fizika, Tome 162 (2010) no. 2, pp. 216-226 Cet article a éte moissonné depuis la source Math-Net.Ru

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We extend cluster perturbation theory to quantum spin systems. As an application, we calculate the spectral function and the density of states of one-particle excitations of a chain of spin 1/2 particles with alternating exchange interaction.
Keywords: cluster perturbation theory, singlet magnetics
Mots-clés : spin chain. 
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     author = {A. S. Ovchinnikov and I. G. Bostrem and Vl. E. Sinitsyn},
     title = {Cluster perturbation theory for spin {Hamiltonians}},
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A. S. Ovchinnikov; I. G. Bostrem; Vl. E. Sinitsyn. Cluster perturbation theory for spin Hamiltonians. Teoretičeskaâ i matematičeskaâ fizika, Tome 162 (2010) no. 2, pp. 216-226. http://geodesic.mathdoc.fr/item/TMF_2010_162_2_a3/

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