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Zeitschrift für Physik B Condensed Matter
ISSN: 0722-3277 (printed version)
ISSN: 1431-584X (electronic version)
Abstract Volume 103 Issue 2 (1997) pp 201-203
Spectral function and self-energy of the one-dimensional Hubbard model in the U -> \infty limit
Frédéric Mila (1), Karlo Penc (2) (*)
(1) Laboratoire de Physique Quantique, Université Paul Sabatier, F-31062 Toulouse, France
(2) Max-Planck-Institut für Physik komplexer Systeme, Bayreuther Strasse 40, D-01187 Dresden, Germany
Abstract. The interpretation of the k dependent spectral functions of the one-dimensional, infinite U Hubbard model obtained by using the factorized wave-function of Ogata and Shiba is revisited. The well defined feature which appears in addition to low energy features typical of Luttinger liquids, and which, close to the Fermi energy, can be interpreted as the shadow band resulting from 2kF spin fluctuations, is further investigated. A calculation of the self-energy shows that, not too close to the Fermi energy, this feature corresponds to a band, i.e. to a solution of the Dyson equation <omega> - &egr;(k) - Re&Sgr; (k,<omega>) =0.
PACS: 79.60.-i; 71.10.Fd; 78.20.Bh
(*) On leave from: Research Institute for Solid State Physics, Budapest, Hungary
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