کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5424434 1395824 2008 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Spatial modulation of the Dirac gap in epitaxial graphene
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
Spatial modulation of the Dirac gap in epitaxial graphene
چکیده انگلیسی
We use scanning tunneling spectroscopy (STS) at low temperatures to investigate the local electronic structure of mono- and bilayer graphene grown epitaxially on SiC(0 0 0 1). Already for monolayer graphene, a gap opening is observed in the π-bands at the Dirac point. The gap size is spatially modulated with the (63×63)R30° periodicity of the interface structure. We ascribe this effect to a spatially dependent interface potential, which is imprinted into the graphene layer. For bilayer graphene the Dirac gap has a constant size, but a spatially localized mid-gap state is observed within. For both, gap state and π-bands the intensities are strongly modulated with the atomic periodicity of graphene.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Surface Science - Volume 602, Issue 22, 15 November 2008, Pages L127-L130
نویسندگان
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