Anomalous self-energy and Fermi surface quasi-splitting in the vicinity of a ferromagnetic instability

Details Anomalous self-energy and Fermi surface quasi-splitting in the vicinity of a ferromagnetic instability Anomalous self-energy and Fermi surface quasi-splitting in the vicinity of a ferromagnetic instability

2004-07-19

arxiv.org/abs/cond-mat/0407473v1

Phys. Rev. B 71, 085105 (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

30 pages, 7 figures, RevTeX

Scientific paper

10.1103/PhysRevB.71.085105

We discuss the low-temperature behavior of the electronic self-energy in the vicinity of a ferromagnetic instability in two dimensions within the two-particle self-consistent approximation, functional renormalization group and Ward-identity approaches. Although the long-range magnetic order is absent at T>0, the self-energy has a non-Fermi liquid form at low energies w<\Delta_0 near the Fermi level, where Delta_0 is the ground-state spin splitting. The spectral function at temperatures T

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