Density-matrix renormalisation group approach to quantum impurity problems

Details Density-matrix renormalisation group approach to quantum impurity problems Density-matrix renormalisation group approach to quantum impurity problems

2003-11-12

arxiv.org/abs/cond-mat/0311291v1

J. Phys.: Condens. Matter 16 (2004) 613-625.

Physics

Condensed Matter

Strongly Correlated Electrons

16 pages, 6 figures, submitted to Journal of Physics: Condensed Matter

Scientific paper

10.1088/0953-8984/16/4/010

A dynamic density-matrix renormalisation group approach to the spectral properties of quantum impurity problems is presented. The method is demonstrated on the spectral density of the flat-band symmetric single-impurity Anderson model. We show that this approach provides the impurity spectral density for all frequencies and coupling strengths. In particular, Hubbard satellites at high energy can be obtained with a good resolution. The main difficulties are the necessary discretisation of the host band hybridised with the impurity and the resolution of sharp spectral features such as the Abrikosov-Suhl resonance.

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