Nanoscale 3-D (E, k(x), k(y)) band structure imaging on graphene and intercalated graphene
Författare
Summary, in English
An x-ray photoemission electron microscope (X-PEEM) equipped with a hemispherical energy analyzer is capable of fast acquisition of momentum-resolved photoelectron angular distribution patterns in a complete cone. We have applied this technique to observe the 3-D (E, k(x), k(y)) electronic band structure of zero-, one-, and two-monolayer (ML) graphene grown ex situ on 6H-SiC(0001) substrates where a carbon buffer layer (zero ML) forms underneath the graphene layer(s). We demonstrate that the interfacial buffer layer can be converted into quasi-free-standing graphene upon intercalation of Li atoms at the interface and that such a graphene is structurally and electronically decoupled from the SiC substrate. High energy and momentum resolution of the X-PEEM, along with short data acquisition times from submicrometer areas on the surface demonstrates the uniqueness and the versatility of the technique and broadens its impact and applicability within surface science and nanotechnology.
Avdelning/ar
Publiceringsår
2011
Språk
Engelska
Sidor
1-6
Publikation/Tidskrift/Serie
IBM Journal of Research and Development
Volym
55
Issue
4
Dokumenttyp
Artikel i tidskrift
Förlag
IBM Corporation
Ämne
- Physical Sciences
- Natural Sciences
Status
Published
ISBN/ISSN/Övrigt
- ISSN: 2151-8556