Journal
PHYSICAL REVIEW LETTERS
Volume 104, Issue 22, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.104.226804
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Funding
- Spanish MEC [FIS2007-65702-C02-01]
- ACI-Promociona [ACI2009-1036]
- Grupos Consolidados UPV/EHU del Gobierno Vasco [IT-319-07]
- European Union [211956]
- Barcelona Supercomputing Center
- Red Espanola de Supercomputacion
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Using first principles many-body theory methods (GW+Bethe-Salpeter equation) we demonstrate that the 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 towards an excitonic Bose-Einstein condensate in graphane that can be observed experimentally.
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