Precursors of Antiferromagnetic and Hubbard Bands in the 2D Hubbard Model

Details Precursors of Antiferromagnetic and Hubbard Bands in the 2D Hubbard Model Precursors of Antiferromagnetic and Hubbard Bands in the 2D Hubbard Model

1998-02-11

arxiv.org/abs/cond-mat/9802113v2

Physics

Condensed Matter

4 pages, revtex, 4 figures

Scientific paper

We formulate a theory to the 2D Hubbard model in a framework free of finite size effect and numerical analytical continuation, yet containing the essential features of the 2D Hubbard model, i.e., the correct atomic limit for large frequencies and 2D spin fluctuations. As temperature is decreased for a 2D half-filled band, 2D critical fluctuations give rise to a strong local maximum in the scattering rates at the chemical potential leading to a split peak in the spectral function. As U is increased, four peaks associated with antiferromagnetic and Hubbard bands begin to develop in small and intermediate frequency regimes.

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