Preformed excitonic liquid route to a charge density wave in 2H-TaSe$_2$

Details Preformed excitonic liquid route to a charge density wave in 2H-TaSe$_2$ Preformed excitonic liquid route to a charge density wave in 2H-TaSe$_2$

2010-08-05

arxiv.org/abs/1008.0942v3

Phys. Rev. Lett. 106, 236405 (2011)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages,8 figures

Scientific paper

Recent experiments on 2H-TaSe$_2$ contradict the long-held view of the charge density wave arising from a nested band structure. An intrinsically strong coupling view, involving a charge density wave state arising as a Bose condensation of preformed excitons emerges as an attractive, albeit scantily investigated alternative. Using local density approximation plus multiorbital dynamic mean-field theory, we show that this scenario agrees with a variety of normal state data for 2H-TaSe$_{2}$. Based thereupon, the ordered states in a subset of dichalcogenides should be viewed as instabilities of a correlated, preformed excitonic liquid.

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