Details

Autor(en) / Beteiligte

• Zhang, H G
• Hu, H
• Pan, Y
• Mao, J H
• Gao, M
• Guo, H M
• Du, S X
• Greber, T
• Gao, H-J

Titel

Graphene based quantum dots

Ist Teil von

• Journal of physics. Condensed matter, 2010-08, Vol.22 (30), p.302001-302001

Ort / Verlag

Bristol: IOP Publishing

Erscheinungsjahr

2010

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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.