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Pseudogaps: A third peak in the fermion spectral function  Oleg Tchernyshyov
;  Date: 
7 Oct 1997  Journal:  Phys.Rev.B 57, 2728 (1998)  Subject:  Strongly Correlated Electrons  condmat.strel  Abstract:  I present an exactly solvable model of a pseudogap with two zeroenergy fermion modes coupled to each other by a classical source of frequency omega_0 and strength Delta. A suitably defined fermion propagator has an infinite number of poles at frequencies that are multiple integers of omega_0. In the adiabatic limit, omega_0 << Delta, the situation is qualitatively different from the static case omega_0=0: the residue of the pole at omega=0 (a remnant of the bare fermion) vanishes linearly with omega_0, a result that could not be anticipated by perturbation theory; the multiple poles of the propagator coalesce into a continuum instead of forming two single poles at +Delta, which should be interpreted as inhomogeneous broadening of the Bogoliubov quasiparticles.  Source:  arXiv, condmat/9710061  Services:  Forum  Review  PDF  Favorites 


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