SU(3) Anderson impurity model: A numerical renormalization group   approach exploiting non-Abelian symmetries
  We show how the density-matrix numerical renormalization group (DM-NRG) method can be used in combination with non-Abelian symmetries such as SU(N), where the decomposition of the direct product of two irreducible representations requires the use of a so-called outer multiplicity label. We apply this scheme to the SU(3) symmetrical Anderson model, for which we analyze the finite size spectrum, determine local fermionic, spin, superconducting, and trion spectral functions, and also compute the temperature dependence of the conductance. Our calculations reveal a rich Fermi liquid structure. 
Catalin Pascu Moca, Arne Alex, Jan von Delft, Gergely Zarand
cond-mat.str-el cond-mat.mes-hall