Theory of Ferromagnetism in Doped Excitonic Condensates

Details Theory of Ferromagnetism in Doped Excitonic Condensates Theory of Ferromagnetism in Doped Excitonic Condensates

2001-12-21

arxiv.org/abs/cond-mat/0112420v1

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 3 postscript files

Scientific paper

10.1103/PhysRevLett.89.086401

Nesting in a semimetal can lead to an excitonic insulator state with spontaneous coherence between conduction and valence bands and a gap for charged excitations. In this paper we present a theory of the ferromagnetic state that occurs when the density of electrons in the conduction band and holes in the valence band differ. We find an unexpectedly rich doping-field phase diagram and an unusual collective excitation spectrum that includes two gapless collective modes. We predict regions of doping and external field in which phase-separated condensates of electrons and holes with parallel spins and opposing spins coexist.

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