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Article overview
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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 | cond-mat.str-el | 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. | Source: | arXiv, cond-mat/9710061 | Services: | Forum | Review | PDF | Favorites |
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