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Quantum-confined electronic states in atomically well-defined graphene nanostructures

By Sampsa K Hämäläinen, Zhixiang Sun, Mark Boneschanscher, Andreas Uppstu, Mari Ijäs, Ari Harju, Daniël AM Vanmaekelbergh and Peter Liljeroth


\u3cp\u3eDespite 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 on an Ir(111) substrate by low-temperature scanning tunneling microscopy and spectroscopy. We measure the atomic structure and local density of states 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 textbook particle-in-a-box problem applied to relativistic massless fermions.\u3c/p\u3

Publisher: 'American Physical Society (APS)'
Year: 2011
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Provided by: Repository TU/e
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