Abstract
A numerical renormalization group treatment of a correlated system requires the existence of an extended range of energy scales in the Hamiltonian. The presence of such an energy scale hierarchy is often not evident. We argue here that the hierarchy of scales in the correlation energy can be brought about by a suitable transformation of the single particle orbitals. We formulate a variational procedure to select the optimal orbitals for a general Hamiltonian. The advantage of this method is exhibited by applying it to an exactly solvable model.
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