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Abstract: We study dynamic ground state properties in the crossover from weak BCS tostrong coupling BEC superfluidity. Our approach is based on the attractiveHubbard model which is analyzed by the dynamical mean field theory DMFTcombined with the numerical renormalization group NRG. We present anextension of the NRG method for effective impurity models to selfconsistentcalculations with superconducting symmetry breaking. In the one particlespectra we show quantitatively how the Bogoliubov quasiparticles at weakcoupling become suppressed at intermediate coupling. We also present resultsfor the spin and charge gap. The extension of the NRG method to selfconsistentsuperconducting solutions opens the possibility to study a range of otherimportant applications.



Autor: J. Bauer, A.C. Hewson

Fuente: https://arxiv.org/







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