新型二维晶体中的强激子:硅烷和锗烷

EPL (Europhysics Letters) Pub Date : 2012-05-01 DOI:10.1209/0295-5075/98/37004

O. Pulci, P. Gori, M. Marsili, V. Garbuio, R. Sole, F. Bechstedt

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引用次数: 105

摘要

我们通过第一性原理计算表明，由于抑制筛选和增强二维约束，在氢化Si和Ge层中出现了具有巨大振子强度的激子共振，这在定性和定量上与石墨烯不同。其巨大的激子结合能和振子强度使其有望在纳米尺度上观察新的物理效应和在光电器件中的应用。

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Strong excitons in novel two-dimensional crystals: Silicane and germanane

We show by first-principles calculations that, due to depressed screening and enhanced two-dimensional confinement, excitonic resonances with giant oscillator strength appear in hydrogenated Si and Ge layers, which qualitatively and quantitatively differ from those of graphane. Their large exciton binding energies and oscillator strengths make them promising for observation of novel physical effects and application in optoelectronic devices on the nanoscale.

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EPL (Europhysics Letters)

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