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J Phys Condens Matter. 2010 Aug 4;22(30):302001. doi: 10.1088/0953-8984/22/30/302001. Epub 2010 Jul 2.

Graphene based quantum dots.

Author information

1
Institute of Physics, Chinese Academy of Sciences, Beijing, People's Republic of China.

Erratum in

  • J Phys Condens Matter. 2010 Oct 6;22(39):399802.

Abstract

Laterally localized electronic states are identified on a single layer of graphene on ruthenium by low temperature scanning tunneling spectroscopy (STS). The individual states are separated by 3 nm and comprise regions of about 90 carbon atoms. This constitutes a highly regular quantum dot-array with molecular precision. It is evidenced by quantum well resonances (QWRs) with energies that relate to the corrugation of the graphene layer. The dI/dV conductance spectra are modeled by a layer height dependent potential-well with a delta-function potential that describes the barrier for electron penetration into graphene. The resulting QWRs are strongest and lowest in energy on the isolated 'hill' regions with a diameter of 2 nm, where the graphene is decoupled from the surface.

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