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

Physical Review Letters 104, 226804 (2010)

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

P. Cudazzo, C. Attaccalite, I.V. Tokatly, A. Rubio

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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http://dx.doi.org/10.1103/PhysRevLett.104.226804
arxiv
http://arxiv.org/abs/arXiv:1003.1167

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