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Infrared absorbance of silicene and germanene

TitleInfrared absorbance of silicene and germanene
Publication TypeJournal Article
Year of Publication2012
AuthorsBechstedt, F., Matthes L., Gori P., & Pulci O.
Keywordsband structure; dielectric function; fine structure; Germanium; graphene; infrared spectra; silicon
Abstract

Calculating the complex dielectric function for optical interband transitions we show that the two-dimensional crystals silicene and germanene possess the same low-frequency absorbance as graphene. It is determined by the Sommerfeld finestructure constant. Deviations occur for higher frequencies when the first interband transitions outside K or K′ contribute. The low-frequency results are a consequence of the honeycomb geometry but do not depend on the group-IV atom, the sheet buckling, and the orbital hybridization. The two-dimensional crystals may be useful as absorption normals in silicon technology.

JournalApplied Physics Letters
Volume100
Issue26
Pagination261906
URLhttp://dx.doi.org/10.1063/1.4731626
Date Published2012/06
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