Bogoliubov shadow bands in the normal state of superconducting systems with strong pair fluctuations
arXiv:cond-mat/0309468 · doi:10.1103/PhysRevLett.91.255301
Abstract
On the basis of a scenario where electron pairing is induced by resonant two-particle scattering (the Boson Fermion model), we show how precursors of the superconducting state - in form of overdamped Bogoliubov modes - emerge in the normal state upon approaching the transition temperature from above. This result is obtained by a renormalization technique based on continuous unitary transformations (the flow equations), projecting out the coherent contributions in the electron spectral function from an incoherent background.
4 pages, 2 figures