Phys. Rev. Lett. 84, 1264–1267 (2000)Ferromagnetism in Doped Excitonic InsulatorsReceived 24 June 1999; published in the issue dated 7 February 2000 The theory of doped excitonic insulators is reinvestigated in light of recent experiments on hexaborides. For the appropriate valley-degenerate X3,X3′ band structure, “intravalley” condensation is energetically favored. Ferromagnetism occurs upon doping due to the quenching of kinetic energy at the otherwise direct first-order excitonic insulator-metal transition. The phase diagram includes states of spatially inhomogeneous density and magnetization at low temperatures. © 2000 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.84.1264
DOI:
10.1103/PhysRevLett.84.1264
PACS:
71.10.Ca, 71.35.-y, 75.10.Lp
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