Exact single spin flip for the Hubbard model in $d=\infty$

Details Exact single spin flip for the Hubbard model in $d=\infty$ Exact single spin flip for the Hubbard model in $d=\infty$

1996-03-05

arxiv.org/abs/cond-mat/9603031v2

Phys. Rev. Lett. 77, 3629 (1996)

Physics

Condensed Matter

4 pages, 3 figures included with psfig, Revtex; Phys. Rev. Lett. in press; some amendments made to clarify the calculation of

Scientific paper

10.1103/PhysRevLett.77.3629

It is shown that the dynamics of a single $\downarrow$-electron interacting with a band of $\uparrow$-electrons can be calculated exactly in the limit of infinite dimension. The corresponding Green function is determined as a continued fraction. It is used to investigate the stability of saturated ferromagnetism and the nature of the ground state for two generic non-bipartite infinite dimensional lattices. Non Fermi liquid behavior is found. For certain dopings the $\downarrow$-electron is bound to the $\uparrow$-holes.

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