We calculate the one-particle spectral functions above the superconducting transition temperature TC, 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 TC is approached.
Henrik Moodysson Rønnow, Goran Nilsen, Martin Mourigal
Henrik Moodysson Rønnow, Diane Virginie Marie Lançon, Nikolay Tsyrulin
Maryna Viazovska, Helmuth Berger