Formation of unconventional standing waves at graphene edges by valley mixing and pseudospin rotation.
Proc Natl Acad Sci U S A
; 108(46): 18622-5, 2011 Nov 15.
Article
em En
| MEDLINE
| ID: mdl-22049340
ABSTRACT
We investigate the roles of the pseudospin and the valley degeneracy in electron scattering at graphene edges. It is found that they are strongly correlated with charge density modulations of short-wavelength oscillations and slowly decaying beat patterns in the electronic density profile. Theoretical analyses using nearest-neighbor tight-binding methods and first-principles density-functional theory calculations agree well with our experimental data from scanning tunneling microscopy. The armchair edge shows almost perfect intervalley scattering with pseudospin invariance regardless of the presence of the hydrogen atom at the edge, whereas the zigzag edge only allows for intravalley scattering with the change in the pseudospin orientation. The effect of structural defects at the graphene edges is also discussed.
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1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Grafite
Idioma:
En
Revista:
Proc Natl Acad Sci U S A
Ano de publicação:
2011
Tipo de documento:
Article