Phase diagram of the excitonic insulator

Details Phase diagram of the excitonic insulator Phase diagram of the excitonic insulator

2005-06-15

arxiv.org/abs/cond-mat/0506374v2

Physica B 378-380, 267 (2006)

Physics

Condensed Matter

Strongly Correlated Electrons

2 pages, 1 figure, SCES'05, accepted for publication in Physica B

Scientific paper

10.1016/j.physb.2006.01.099

Motivated by recent experiments, which give strong evidence for an excitonic insulating phase in $\rm TmSe_{0.45}Te_{0.55}$, we developed a scheme to quantitatively construct, for generic two-band models, the phase diagram of an excitonic insulator. As a first application of our approach, we calculated the phase diagram for an effective mass two-band model with long-range Coulomb interaction. The shielded potential approximation is used to derive a generalized gap equation controlling for positive (negative) energy gaps the transition from a semi-conducting (semi-metallic) phase to an insulating phase. Numerical results,obtained within the quasi-static approximation, show a steeple-like phase diagram in contrast to long-standing expectations.

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