Cluster perturbation theory for spin Hamiltonians
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.
- Publication:
-
Theoretical and Mathematical Physics
- Pub Date:
- February 2010
- DOI:
- Bibcode:
- 2010TMP...162..179O
- Keywords:
-
- cluster perturbation theory;
- singlet magnetics;
- spin chain