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physics.comp-ph2003
A Matrix Kato-Bloch Perturbation Method for Hamiltonian Systems
S. Moukouri
A generalized version of the Kato-Bloch perturbation expansion is presented. It consists of replacing simple numbers appearing in the perturbative series by matrices. This leads to…
cond-mat.str-el2003
Renormalization group method for weakly-coupled quantum chains: application to the spin one-half Heisenberg model
S. Moukouri
The Kato-Bloch perturbation formalism is used to present a density-matrix renormalization-group (DMRG) method for strongly anisotropic two-dimensional systems. This method is used…