Berlin 2008 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 32: Correlated Electrons: Poster Session

TT 32.42: Poster

Thursday, February 28, 2008, 14:00–18:00, Poster B

Direct calculation of self-energies of the infinite-dimensional Hubbard model by D-DMRG — •Patrick Grete, Carsten Raas, and Götz S. Uhrig — Theoretische Physik I, Technische Universität Dortmund, 44221 Dortmund

We treat the infinite-dimensional Hubbard model within a DMFT-framework by solving the local impurity-problem (SIAM) within dynamic density-matrix-renormalisation (D-DMRG). Instead of extracting the self-energies in a numerically unstable way via the Dyson equation, we use a modified Green function to calculate the self-energies directly. In addition to sharp excitation peaks at the inner edges of the Hubbard bands, we find trough-like features in the imaginary part of the self-energy. They correspond to kinks in the real part of the self-energy. Their relation to collective modes is discussed.