Bogoliubov shadow bands in the normal state of superconducting systems with strong pair fluctuations

Details Bogoliubov shadow bands in the normal state of superconducting systems with strong pair fluctuations Bogoliubov shadow bands in the normal state of superconducting systems with strong pair fluctuations

2003-09-19

arxiv.org/abs/cond-mat/0309468v1

Phys. Rev. Lett. 91, 255301 (2003)

Physics

Condensed Matter

Superconductivity

4 pages, 2 figures

Scientific paper

10.1103/PhysRevLett.91.255301

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.

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