%0 Journal Article
%T Control of the finite size corrections in exact diagonalization studies
%A Claudius Gros
%J Physics
%D 1995
%I arXiv
%R 10.1103/PhysRevB.53.6865
%X We study the possibility of controlling the finite size corrections in exact diagonalization studies quantitatively. We consider the one- and two dimensional Hubbard model. We show that the finite-size corrections can be be reduced systematically by a grand-canonical integration over boundary conditions. We find, in general, an improvement of one order of magnitude with respect to studies with periodic boundary conditions only. We present results for ground-state properties of the 2D Hubbard model and an evaluation of the specific heat for the 1D and 2D Hubbard model.
%U http://arxiv.org/abs/cond-mat/9511113v1