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arXiv 1003.1167cond-mat.mtrl-scicond-mat.quant-gas
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石墨烷中的强电荷转移激子效应和玻色-爱因斯坦激子凝聚

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

Pierluigi Cudazzo, Claudio Attacalite, Ilya V. Tokatly, Angel Rubio

摘要:

使用第一性原理多体理论方法(GW+BSE),我们证明了石墨烷的光学性质主要由增强的电子相关在二维电介质中的本地化电荷转移激发。强的电子-空穴相互作用导致小半径束缚激子的出现,其中电子和空穴在空间上分离,它们分别位于面外和面内。这种束缚激子的存在为石墨烷中的激子玻色-爱因斯坦凝聚体开辟了一条可以通过实验观察到的道路。

英文摘要:

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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