Single-particle dynamics of the Anderson model: a two-self-energy description within the numerical renormalization group approach

Details Single-particle dynamics of the Anderson model: a two-self-energy description within the numerical renormalization group approach Single-particle dynamics of the Anderson model: a two-self-energy description within the numerical renormalization group approach

2005-11-29

arxiv.org/abs/cond-mat/0511698v1

J. Phys.: Condens. Matter 17, 6959 (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

12 pages, 6 figures

Scientific paper

10.1088/0953-8984/17/43/013

Single-particle dynamics of the Anderson impurity model are studied using both the numerical renormalization group (NRG) method and the local moment approach (LMA). It is shown that a 'two-self-energy' description of dynamics inherent to the LMA, as well as a conventional 'single-self-energy' description, arise within NRG; each yielding correctly the same local single-particle spectrum. Explicit NRG results are obtained for the broken symmetry spectral constituents arising in a two-self-energy description, and the total spectrum. These are also compared to analytical results obtained from the LMA as implemented in practice. Very good agreement between the two is found, essentially on all relevant energy scales from the high-energy Hubbard satellites to the low-energy Kondo resonance.

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