Pseudogaps: A third peak in the fermion spectral function

Preprint

7 October 1997

preprint
Published by arXiv in arXiv

https://doi.org/10.48550/arXiv.cond-mat/9710061

Abstract

I present an exactly solvable model of a pseudogap with two zero-energy 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.

Keywords

All Related Versions

Version 1, 1997-10-07, ArXiv
Published version: Physical Review B, 57 (5), 2728.

This publication has 0 references indexed in Scilit: