Anomalous Self-Energy Features in the 2D Hubbard Model

A. Avella and F. Mancini Dipartimento di Fisica "E.R. Caianiello" - Unità CNISM di Salerno, Università degli Studi di Salerno, 84081 Baronissi (SA), Italy

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Received: 9 07 2007;

The electronic self-energy of the two-dimensional Hubbard model, computed in the non-crossing approximation within the composite operator method, is studied as a function of frequency as well as temperature at the Fermi surface, for a value of doping at which the pseudogap is already well developed. For values of momentum belonging to the phantom arc of the Fermi surface, both dependences show anomalous power law behavior in contrast to that expected from the Fermi liquid theory.

DOI: 10.12693/APhysPolA.113.395 PACS numbers: 71.10.Fd, 71.27.+a, 71.10.-w