Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2010-04-30
Physics
Condensed Matter
Strongly Correlated Electrons
25 pp, 10 figs. to be published in PRB
Scientific paper
We study theoretically the simultaneous, photo-induced two-particle excitations of strongly correlated systems on the basis of the Hubbard model. Under certain conditions specified in this work, the corre- sponding transition probability is related to the two-particle spectral function which we calculate using three different methods: the dynamical-mean field theory combined with quantum Monte Carlo (DMFT- QMC) technique, the first order perturbation theory and the ladder approximations. The results are analyzed and compared for systems at the verge of the metal-insulator transitions. The dependencies on the electronic correlation strength and on doping are explored. In addition, the account for the orbital degeneracy allows an insight into the influence of interband correlations on the two particle excitations. A suitable experimental realization is discussed.
Berakdar Jamal
Napitu B. D.
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