Journal
SCIENCE
Volume 320, Issue 5874, Pages 356-358Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1154663
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Funding
- EPSRC [EP/E051227/1, EP/D040264/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/E051227/1, EP/C511875/1, EP/D040264/1] Funding Source: researchfish
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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.
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