Density matrix numerical renormalization group for non-Abelian symmetries
Mesoscale and Nanoscale Physics
2009-11-13 v1
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.
Keywords
Cite
@article{arxiv.0802.4332,
title = {Density matrix numerical renormalization group for non-Abelian symmetries},
author = {A. I. Toth and C. P. Moca and O. Legeza and G. Zarand},
journal= {arXiv preprint arXiv:0802.4332},
year = {2009}
}
Comments
12 pages, 6 figures, PRB format