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

TitleStrong excitons in novel two-dimensional crystals: Silicane and germanane
Publication TypeJournal Article
Year of Publication2012
AuthorsPulci, O., Gori P., Marsili M., Garbuio V., Del Sole R., & Bechstedt F.
Keywordsabsorption; GRAPHANE; graphene; hydrogenation; NANOSHEETS; OPTICAL-PROPERTIES; Polymers; POLYSILANE; SILOXENE
Abstract

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.

JournalEPL (Europhysics Letters)
Pagination37004
URLhttp://dx.doi.org/10.1209/0295-5075/98/37004
Date Published2012/05
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