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Manifestation of the Upper Hubbard band in the 2D Hubbard model at low electron density | | M.Yu. Kagan
; V.V. Val'kov
; P. Woelfle
; | | Date: |
23 May 2011 | | Abstract: | We consider the 2D Hubbard model in the strong-coupling case (U>>W) and at
low electron density (nd^2<<1). We find an antibound state as a pole in the
two-particle T-matrix. The contribution of this pole in the self-energy
reproduces a two-pole structure in the dressed one-particle Green-function
similar to the Hubbard-I approximation. We also discuss briefly the
Engelbrecht-Randeria mode which corresponds to the pairing of two holes below
the bottom of the band for U>>W and low electron density. Both poles produce
non-trivial corrections to Landau Fermi-liquid picture already at low electron
density but do not destroy it in 2D | | Source: | arXiv, 1105.4428 | | Services: | Forum | Review | PDF | Favorites | |
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