Excitation spectrum of the two-dimensional attractive Hubbard model

We calculate the one-particle spectral functions above the superconducting transition temperature T C, in the framework of a functional integral approach. The coupling of the electronic self-energy to pair fluctuations, which are treated by means of a time-dependent Ginzburg–Landau equation, yields...

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Bibliographic Details
Published in:Physica. C, Superconductivity Superconductivity, 1999-05, Vol.317, p.482-485
Main Authors: Capezzali, Massimiliano, Beck, Hans
Format: Article
Language:English
Subjects:
Excitation spectrum
Hubbard model
Transition temperature
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Summary:We calculate the one-particle spectral functions above the superconducting transition temperature T C, in the framework of a functional integral approach. The coupling of the electronic self-energy to pair fluctuations, which are treated by means of a time-dependent Ginzburg–Landau equation, yields a double-peak structure, around the Fermi wavenumber. The peak separation is essentially temperature-independent, but the structure sharpens when T C is approached.
ISSN:0921-4534
1873-2143
DOI:10.1016/S0921-4534(99)00104-5