Jolie, Wouter, Craes, Fabian, Petrovic, Marin ORCID: 0000-0002-2234-1207, Atodiresei, Nicolae ORCID: 0000-0002-8203-1227, Caciuc, Vasile ORCID: 0000-0002-4814-2417, Bluegel, Stefan, Kralj, Marko ORCID: 0000-0002-9786-3130, Michely, Thomas and Busse, Carsten ORCID: 0000-0001-5522-0578 (2014). Confinement of Dirac electrons in graphene quantum dots. Phys. Rev. B, 89 (15). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9969

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Abstract

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-D = (0.64 +/- 0.07) eV] and has a Fermi velocity close to the one of free-standing graphene [nu(F) = (0.96 +/- 0.07) x 10(6) m/s].

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Jolie, WouterUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Craes, FabianUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Petrovic, MarinUNSPECIFIEDorcid.org/0000-0002-2234-1207UNSPECIFIED
Atodiresei, NicolaeUNSPECIFIEDorcid.org/0000-0002-8203-1227UNSPECIFIED
Caciuc, VasileUNSPECIFIEDorcid.org/0000-0002-4814-2417UNSPECIFIED
Bluegel, StefanUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kralj, MarkoUNSPECIFIEDorcid.org/0000-0002-9786-3130UNSPECIFIED
Michely, ThomasUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Busse, CarstenUNSPECIFIEDorcid.org/0000-0001-5522-0578UNSPECIFIED
URN: urn:nbn:de:hbz:38-440426
DOI: 10.1103/PhysRevB.89.155435
Journal or Publication Title: Phys. Rev. B
Volume: 89
Number: 15
Date: 2014
Publisher: AMER PHYSICAL SOC
Place of Publication: COLLEGE PK
ISSN: 2469-9969
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
TUNNELING SPECTROSCOPY; SURFACE-STATEMultiple languages
Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed MatterMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/44042

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