Density matrix numerical renormalization group for non-Abelian symmetries
arXiv:0802.4332 · doi:10.1103/PhysRevB.78.245109
Abstract
We generalize the spectral sum rule preserving density matrix numerical renormalization group (DM-NRG) method in such a way that it can make use of an arbitrary number of not necessarily Abelian, local symmetries present in the quantum impurity system. We illustrate the benefits of using non-Abelian symmetries by the example of calculations for the T-matrix of the two-channel Kondo model in the presence of magnetic field, for which conventional NRG methods produce large errors and/or take a long run-time.
12 pages, 6 figures, PRB format
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