This article is cited in 8 papers

Cluster perturbation theory for spin Hamiltonians

A. S. Ovchinnikov, I. G. Bostrem, Vl. E. Sinitsyn

Ural State University, Ekaterinburg, Russia

Abstract: 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, spin chain.

Received: 04.08.2009

DOI: 10.4213/tmf6465

 English version: Theoretical and Mathematical Physics, 2010, 162:2, 179–187

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