Abstract
We have studied both the symmetric and asymmetric period. Anderson model in one dimension using the density matrix formulation of the numerical renormalization group. We have calculated the charge gap, spin gap and quasiparticle gap as a function of the repulsive interaction U using open boundary conditions for lattices up to 24 sites at half filling. We find that the charge gap is larger than the spin gap for all U for both the symmetric and asymmetric cases.
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