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The Numerical Renormalization Group is used to solve quantum impurityproblems, which describe magnetic impurities in metals, nanodevices, andcorrelated materials within DMFT. Here we present a simple generalization ofthe Wilson Chain, which improves the scaling of computational cost with thenumber of channels/bands, bringing new problems within reach. The method isapplied to calculate the t-matrix of the three-channel Kondo model at T=0,which shows universal crossovers near non-Fermi liquid critical points. Anon-integrable three-impurity problem with three bands is also studied,revealing a rich phase diagram and novel screening/overscreening mechanisms.

Generalized Wilson Chain for solving multichannel quantum impurity problems