Universität zu Köln

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:	Creators Email ORCID ORCID Put Code Jolie, Wouter UNSPECIFIED UNSPECIFIED UNSPECIFIED Craes, Fabian UNSPECIFIED UNSPECIFIED UNSPECIFIED Petrovic, Marin UNSPECIFIED orcid.org/0000-0002-2234-1207 UNSPECIFIED Atodiresei, Nicolae UNSPECIFIED orcid.org/0000-0002-8203-1227 UNSPECIFIED Caciuc, Vasile UNSPECIFIED orcid.org/0000-0002-4814-2417 UNSPECIFIED Bluegel, Stefan UNSPECIFIED UNSPECIFIED UNSPECIFIED Kralj, Marko UNSPECIFIED orcid.org/0000-0002-9786-3130 UNSPECIFIED Michely, Thomas UNSPECIFIED UNSPECIFIED UNSPECIFIED Busse, Carsten UNSPECIFIED orcid.org/0000-0001-5522-0578 UNSPECIFIED
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:	Keywords Language TUNNELING SPECTROSCOPY; SURFACE-STATE Multiple languages Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/44042