Electron-hole pair condensation at the semimetal-semiconductor transition: a BCS-BEC crossover scenario

Details Electron-hole pair condensation at the semimetal-semiconductor transition: a BCS-BEC crossover scenario Electron-hole pair condensation at the semimetal-semiconductor transition: a BCS-BEC crossover scenario

2012-01-27

arxiv.org/abs/1201.5816v2

Phys. Rev. B 85, 121102(R) (2012)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 5 figures, substantially revised version

Scientific paper

We act on the suggestion that an excitonic insulator state might separate---at very low temperatures---a semimetal from a semiconductor and ask for the nature of these transitions. Based on the analysis of electron-hole pairing in the extended Falicov-Kimball model, we show that tuning the Coulomb attraction between both species, a continuous crossover between a BCS-like transition of Cooper-type pairs and a Bose-Einstein condensation of preformed tightly-bound excitons might be achieved in a solid-state system. The precursor of this crossover in the normal state might cause the transport anomalies observed in several strongly correlated mixed-valence compounds.

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