✦ LIBER ✦

Weakening of antiferromagnetic correlations by doping in the 2D Hubbard model

✍ Scribed by B Kyung

Publisher: Elsevier Science
Year: 2000
Tongue: English
Weight: 149 KB
Volume: 61
Category: Article
ISSN: 0022-3697
DOI: 10.1016/s0022-3697(99)00233-4

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✦ Synopsis

The temperature and doping dependence of the 2D Hubbard model is studied in the intermediate coupling regime U 4: Strong 2D critical spin fluctuations dominating near half-filling are completely destroyed upon about 14% doping concentration, below which the imaginary part of the self-energy vanishes nearly quadratically in both frequency and temperature, a characteristic feature for the Fermi liquid. As the doping concentration is increased from half-filling, dynamical spin susceptibility shows a change from commensurate to incommensurate structure, leading to a three-peak structure in the spectral function in some region of the Brillouin zone.

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