Unexpected Structures for Intercalation of Sodium in Epitaxial Graphene-SiC Interfaces

Details Unexpected Structures for Intercalation of Sodium in Epitaxial Graphene-SiC Interfaces Unexpected Structures for Intercalation of Sodium in Epitaxial Graphene-SiC Interfaces

2011-11-29

arxiv.org/abs/1111.7009v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

10 pages text, 2 pages, references, and 4 figure pages

Scientific paper

We show using scanning tunneling microscopy, spectroscopy, and ab initio calculations that several intercalation structures exist for Na in epitaxial graphene on SiC(0001). Intercalation takes place at room temperature and Na electron-dopes the graphene. It intercalates in-between single-layer graphene and the carbon-rich interfacial layer. It also penetrates beneath the interfacial layer and decouples it to form a second graphene layer. This decoupling is accelerated by annealing and is verified by direct Na deposition onto the interface layer. Our observations show that intercalation in graphene is fundamentally different than in graphite and is a versatile means of electronic control.

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