Weak Ferromagnetism and Excitonic Condensates

Details Weak Ferromagnetism and Excitonic Condensates Weak Ferromagnetism and Excitonic Condensates

2001-05-12

arxiv.org/abs/cond-mat/0105245v1

Phys. Rev. B 65, 014428 (2002)

Physics

Condensed Matter

Strongly Correlated Electrons

10 Pages, 8 Figures, RevTeX

Scientific paper

10.1103/PhysRevB.65.014428

We investigate a model of excitonic ordering (i.e electron-hole pair condensation) appropriate for the divalent hexaborides. We show that the inclusion of imperfectly nested electron hole Fermi surfaces can lead to the formation of an undoped excitonic metal phase. In addition, we find that weak ferromagnetism with compensated moments arises as a result of gapless excitations. We study the effect of the low lying excitations on the density of states, Fermi surface topology and optical conductivity and compare to available experimental data.

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