Theory of Doped Excitonic Insulators

Details Theory of Doped Excitonic Insulators Theory of Doped Excitonic Insulators

1999-06-17

arxiv.org/abs/cond-mat/9906259v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages

Scientific paper

The theory of doped excitonic insulators is reinvestigated in light of recent experiments on hexaborides. For the appropriate valley-degenerate X_3,X_3' band structure, ``intra-valley'' 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.

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