Bogoliubov Shadow Bands in the Normal State of Superconducting Systems with Strong Pair Fluctuations
T. Domanski, J. Ranninger
DOI 10.1103/PhysRevLett.91.255301 · Physical Review Letters
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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 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.
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