Quasiparticle excitations and dynamic susceptibilities in the BCS-BEC crossover

Details Quasiparticle excitations and dynamic susceptibilities in the BCS-BEC crossover Quasiparticle excitations and dynamic susceptibilities in the BCS-BEC crossover

2008-11-07

arxiv.org/abs/0811.1188v3

EPL 85 (2009) 27001

Physics

Condensed Matter

Superconductivity

6 pages, 5 figures (minor amendments and additional reference)

Scientific paper

10.1209/0295-5075/85/27001

We study dynamic ground state properties in the crossover from weak (BCS) to strong coupling (BEC) superfluidity. Our approach is based on the attractive Hubbard model which is analyzed by the dynamical mean field theory (DMFT) combined with the numerical renormalization group (NRG). We present an extension of the NRG method for effective impurity models to selfconsistent calculations with superconducting symmetry breaking. In the one particle spectra we show quantitatively how the Bogoliubov quasiparticles at weak coupling become suppressed at intermediate coupling. We also present results for the spin and charge gap. The extension of the NRG method to selfconsistent superconducting solutions opens the possibility to study a range of other important applications.

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