Pseudogap and spectral function from superconducting fluctuations to the bosonic limit

Details Pseudogap and spectral function from superconducting fluctuations to the bosonic limit Pseudogap and spectral function from superconducting fluctuations to the bosonic limit

2002-02-06

arxiv.org/abs/cond-mat/0202084v1

Phys. Rev. B 66, 024510 (2002)

Physics

Condensed Matter

Superconductivity

19 pages, 18 figures

Scientific paper

10.1103/PhysRevB.66.024510

The crossover from weak to strong coupling for a three dimensional continuum model of fermions interacting via an attractive contact potential is studied above the superconducting critical temperature. The pair-fluctuation propagator, the one-loop self-energy, and the spectral function are investigated in a systematic way from the superconducting fluctuation regime (weak coupling) to the bosonic regime (strong coupling). Analytic and numerical results are reported. In the strong-coupling regime, where the pair fluctuation propagator has bosonic character, two quite different peaks appear in the spectral function, a broad one at negative frequencies and a narrow one at positive frequencies. By decreasing coupling, the two-peak structure evolves smoothly. In the weak-coupling regime, where the fluctuation propagator has diffusive Ginzburg-Landau character, the overall line-shape of the spectral function is more symmetric. The systematic analysis of the spectral function identifies specific features which allow one to distinguish by ARPES whether a system is in the weak- or strong-coupling regime. Connection of the results of our analysis with the phenomenology of cuprate superconductors is also attempted and rests on the recently introduced two-gap model.

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