Weak-coupling approach to the semi-infinite Hubbard model: Non-locality of the self-energy

Zeitschrift fur Physik B-Condensed Matter

Volumn 104, Issue 2, 1997, Pages 265-277

  Potthoff, M ^a   Nolting, W ^a  

^a HUMBOLDT UNIVERSITY   (Germany)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 12344318771     PISSN: 07223277     EISSN: None     Source Type: Journal    
DOI: 10.1007/s002570050449     Document Type: Article

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60. 3 behavior derived from (6). Thus, contrary to a statement in [17], the on-site self-energy imaginary part does not vanish quadratically (at n = 1).
61. The overall three-peak structure of the QDOS has been observed in previous SOPT-HF studies [17, 33]. It is remarkable that indications of the splitting into an upper and a lower Hubbard band appear in a weak-coupling approach. This might be ascribed to the fact that (at half-filling) the SOPT-HF self-energy (accidentally) recovers the atomic limit and exhibits the correct high-energy behavior.
62. k(E) < 0 in certain (small) regions of the (k, E) space, i. e. to unphysical results. No such difficulties arise for the k integrated bulk (and layer-dependent surface) QDOS which is always positive definite for each s. phys. B 104. 279-287 (1997)