@article{
 title = {Perturbation expansion for 2-D Hubbard model},
 type = {article},
 year = {2000},
 identifiers = {[object Object]},
 pages = {17},
 volume = {63},
 websites = {http://arxiv.org/abs/cond-mat/0010313},
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 created = {2016-12-15T10:10:37.000Z},
 file_attached = {false},
 profile_id = {12182ba0-f80b-33ff-8da5-1813b38b682d},
 group_id = {cdcb8957-8cf3-363b-9214-f32b9c0182f1},
 last_modified = {2016-12-15T10:10:37.000Z},
 read = {false},
 starred = {false},
 authored = {false},
 confirmed = {true},
 hidden = {false},
 citation_key = {Zlatic2000},
 source_type = {article},
 abstract = {We develop an efficient method to calculate the third-order corrections to the self-energy of the hole-doped two-dimensional Hubbard model in space-time representation. Using the Dyson equation we evaluate the renormalized spectral function in various parts of the Brillouin zone and find significant modifications with respect to the second-order theory even for rather small values of the coupling constant U. The spectral function becomes unphysical for U simeq W where W is the half-width of the conduction band. Close to the Fermi surface and for U<W, the single-particle spectral weight is reduced in a finite energy interval around the Fermi energy. The increase of U opens a gap between the occupied and unoccupied parts of the spectral function.},
 bibtype = {article},
 author = {Zlatic, V and Horvatic, B and Dolicki, B and Grabowski, S and Entel, P and Schotte, K D},
 journal = {Physical Review B},
 number = {3}
}

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