Bogoliubov shadow bands in the normal state of superconducting systems with strong pair fluctuations.
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 the 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.
Domanski
T
T
Centre de Recherches sur les Très Basses Températures associé à l'Université Joseph Fourier, CNRS, BP 166, 38042 Grenoble-Cédex 9, France.
Ranninger
J
J