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ReportsChaotic Dirac Billiard in Graphene Quantum DotsThe 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.
1 Manchester Centre for Mesoscience and Nanotechnology, University of Manchester, Manchester M13 9PL, UK. * To whom correspondence should be addressed. E-mail: novoselov{at}manchester.ac.uk
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Science. ISSN 0036-8075 (print), 1095-9203 (online)
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