Confinement of Dirac electrons in graphene quantum dots

Wouter Jolie, Fabian Craes, Marin Petrović, Nicolae Atodiresei, Vasile Caciuc, Stefan Blügel, Marko Kralj, Thomas Michely, and Carsten Busse
Phys. Rev. B 89, 155435 – Published 29 April 2014

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 [ED=0.64±0.07 eV] and has a Fermi velocity close to the one of free-standing graphene [vF=0.96±0.07×106 m/s].

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  • Received 17 January 2014
  • Revised 10 April 2014

DOI:https://doi.org/10.1103/PhysRevB.89.155435

©2014 American Physical Society

Authors & Affiliations

Wouter Jolie1, Fabian Craes1,*, Marin Petrović2, Nicolae Atodiresei3, Vasile Caciuc3, Stefan Blügel3, Marko Kralj2, Thomas Michely1, and Carsten Busse1

  • 1II. Physikalisches Institut, Universität zu Köln, Zülpicher Straße 77, 50937 Köln, Germany
  • 2Institut za fiziku, Bijenička 46, 10000 Zagreb, Croatia
  • 3Peter Grünberg Institut (PGI) and Institute for Advanced Simulation (IAS), Forschungszentrum Jülich and JARA, 52425 Jülich, Germany

  • *craes@ph2.uni-koeln.de

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Issue

Vol. 89, Iss. 15 — 15 April 2014

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