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

T. Domanski·J. Ranninger
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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.

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T. Domanski, J. Ranninger. 2003-09-19. Bogoliubov shadow bands in the normal state of superconducting systems with strong pair fluctuations. https://doi.org/10.1103/physrevlett.91.255301

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