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. © 2010 The American Physical Society.
Strong charge-transfer excitonic effects and the bose-einstein exciton condensate in graphane / Cudazzo, P.; Attaccalite, C.; Tokatly, I. V.; Rubio, A.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 104:22(2010). [10.1103/PhysRevLett.104.226804]
Strong charge-transfer excitonic effects and the bose-einstein exciton condensate in graphane
Cudazzo P.;
2010-01-01
Abstract
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. © 2010 The American Physical Society.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione
