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Science. 2008 Apr 18;320(5874):356-8. doi: 10.1126/science.1154663.

Chaotic Dirac billiard in graphene quantum dots.

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1
Manchester Centre for Mesoscience and Nanotechnology, University of Manchester, Manchester M13 9PL, UK.

Abstract

The exceptional electronic properties of graphene, with its charge carriers mimicking relativistic quantum particles and its formidable potential in various applications, have ensured a rapid growth of interest in this new material. We report on electron transport in quantum dot devices carved entirely from graphene. At large sizes (>100 nanometers), they behave as conventional single-electron transistors, exhibiting periodic Coulomb blockade peaks. For quantum dots smaller than 100 nanometers, the peaks become strongly nonperiodic, indicating a major contribution of quantum confinement. Random peak spacing and its statistics are well described by the theory of chaotic neutrino billiards. Short constrictions of only a few nanometers in width remain conductive and reveal a confinement gap of up to 0.5 electron volt, demonstrating the possibility of molecular-scale electronics based on graphene.

PMID:
18420930
DOI:
10.1126/science.1154663
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