Multiexciton molecules in the hexaborides

Details Multiexciton molecules in the hexaborides Multiexciton molecules in the hexaborides

2000-10-23

arxiv.org/abs/cond-mat/0010344v1

Eur. Phys. J. B 21, 491 (2001)

Physics

Condensed Matter

Materials Science

RevTEX, 7 pages with 3 figures

Scientific paper

10.1007/s100510170158

We investigate multiexciton bound states in a semiconducting phase of divalent hexaborides. Due to three degenerate valleys in both the conduction and valence bands the binding energy of a 6-exciton molecule is greatly enhanced by the shell effect. The ground state energies of multiexciton molecules are calculated using the density functional formalism. We also show that charged impurities stabilize multiexciton complexes leading to condensation of localized excitons. These complexes can act as nucleation centers of local moments.

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