Spin degrees of freedom and flattening of the spectra of single-particle excitations in strongly correlated Fermi systems

Details Spin degrees of freedom and flattening of the spectra of single-particle excitations in strongly correlated Fermi systems Spin degrees of freedom and flattening of the spectra of single-particle excitations in strongly correlated Fermi systems

2003-08-15

arxiv.org/abs/cond-mat/0308309v1

Phys. At. Nucl. 66, 1871 (2003)

Physics

Condensed Matter

Strongly Correlated Electrons

7 pages, 15 figures

Scientific paper

10.1134/1.1619498

The impact of long-range spin-spin correlations on the structure of a flat portion in single-particle spectra $\xi(p)$, which emerges beyond the point, where the Landau state loses its stability, is studied. We supplement the well-known Nozieres model of a Fermi system with limited scalar long-range forces by a similar long-range spin-dependent term and calculate the spectra versus its strength $g$. It is found that Nozieres results hold as long as $g>0$. However, with $g$ changing its sign, the spontaneous magnetization is shown to arise at any nonzero $g$. The increase of the strength $|g|$ is demonstrated to result in shrinkage of the domain in momentum space, occupied by the flat portion of $\xi(p)$, and, eventually, in its vanishing.

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