Strong charge-transfer excitonic effects and Bose-Einstein exciton-condensate in graphane

Details Strong charge-transfer excitonic effects and Bose-Einstein exciton-condensate in graphane Strong charge-transfer excitonic effects and Bose-Einstein exciton-condensate in graphane

2010-03-05

arxiv.org/abs/1003.1167v1

Physics

Condensed Matter

Materials Science

8 pages, 6 figures

Scientific paper

Using first principles many-body theory methods (GW+BSE) we demonstrate that optical properties of graphane are dominated by localized charge-transfer excitations governed by enhanced electron correlations in a two-dimensional dielectric medium. Strong electron-hole interaction leads to the appearance of small radius bound excitons with spatially separated electron and hole, which are localized out-of-plane and in-plane, respectively. The presence of such bound excitons opens the path on excitonic Bose-Einstein condensate in graphane that can be observed experimentally.

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