Quantum confined electronic states in atomically well-defined graphene nanostructures

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 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.

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graphene, quantum dot, scanning tunneling microscopy

DOI

10.1103/PhysRevLett.107.236803

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Hämäläinen , S , Sun , Z , Boneschanscher , M P , Uppstu , C , Ijäs , M , Harju , A , Vanmaekelbergh , D & Liljeroth , P 2011 , ' Quantum confined electronic states in atomically well-defined graphene nanostructures ' , Physical Review Letters , vol. 107 , no. 23 , 236803 , pp. 1-5 . https://doi.org/10.1103/PhysRevLett.107.236803

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https://urn.fi/URN:NBN:fi:aalto-201609163836

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[article-cris] Perustieteiden korkeakoulu / SCI

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