Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2011-10-19
Phys. Rev. Lett. 107, 236803 (2011)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
accepted for publication in Phys. Rev. Lett
Scientific paper
10.1103/PhysRevLett.107.236803
Despite the enormous interest in the properties of graphene and the potential of graphene nanostructures in electronic applications, the study of quantum confined states in atomically well-defined graphene nanostructures remains an experimental challenge. Here, we study graphene quantum dots (GQDs) with well-defined edges in the zigzag direction, grown by chemical vapor deposition (CVD) on an iridium(111) substrate, by low-temperature scanning tunneling microscopy (STM) and spectroscopy (STS). We measure the atomic structure and local density of states (LDOS) of individual GQDs as a function of their size and shape in the range from a couple of nanometers up to ca. 20 nm. The results can be quantitatively modeled by a relativistic wave equation and atomistic tight-binding calculations. The observed states are analogous to the solutions of the text book "particle-in-a-box" problem applied to relativistic massless fermions.
Boneschanscher Mark P.
Hämäläinen Sampsa
Harju Ari
Ijäs Mari
Liljeroth Peter
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