Density matrix numerical renormalization group for non-Abelian symmetries

Details Density matrix numerical renormalization group for non-Abelian symmetries Density matrix numerical renormalization group for non-Abelian symmetries

2008-02-29

arxiv.org/abs/0802.4332v1

Phys. Rev. B 78, 245109 (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

12 pages, 6 figures, PRB format

Scientific paper

10.1103/PhysRevB.78.245109

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.

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