Confinement of Dirac electrons in graphene quantum dots

We observe spatial confinement of Dirac states on epitaxial graphene quantum dots with low-temperature scanning tunneling microscopy after using oxygen as an intercalant to suppress the surface state of Ir(111) and to effectively decouple graphene from its metal substrate. We analyze the confined el...

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Bibliographic Details
Published in:Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2014-04, Vol.89 (15), Article 155435
Main Authors: Jolie, Wouter, Craes, Fabian, Petrović, Marin, Atodiresei, Nicolae, Caciuc, Vasile, Blügel, Stefan, Kralj, Marko, Michely, Thomas, Busse, Carsten
Format: Article
Language:English
Subjects:
Condensed matter
Confinement
Dispersions
Electron states
Epitaxy
Graphene
Quantum dots
Scanning tunneling microscopy
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Summary:We observe spatial confinement of Dirac states on epitaxial graphene quantum dots with low-temperature scanning tunneling microscopy after using oxygen as an intercalant to suppress the surface state of Ir(111) and to effectively decouple graphene from its metal substrate. We analyze the confined electronic states with a relativistic particle-in-a-box model and find a linear dispersion relation. The oxygen-intercalated graphene is p doped [E sub(D) = (0.64 + or - 0.07) eV] and has a Fermi velocity close to the one of free-standing graphene [v sub(F) = (0.96 + or - 0.07) x 10 super(6) m/s].
ISSN:1098-0121
1550-235X
DOI:10.1103/PhysRevB.89.155435