Статья

Chaotic Dirac Billiard in Graphene Quantum Dots

Л. А. ПономаренкоInstitute for Molecules and Materials, Radboud University Nijmegen, 6525 ED Nijmegen, NetherlandsF. SchedinInstitute for Molecules and Materials, Radboud University Nijmegen, 6525 ED Nijmegen, NetherlandsM. I. KatsnelsonInstitute for Molecules and Materials, Radboud University Nijmegen, 6525 ED Nijmegen, NetherlandsRui YangInstitute for Molecules and Materials, Radboud University Nijmegen, 6525 ED Nijmegen, NetherlandsE.W. HillInstitute for Molecules and Materials, Radboud University Nijmegen, 6525 ED Nijmegen, NetherlandsKostya S. NovoselovInstitute for Molecules and Materials, Radboud University Nijmegen, 6525 ED Nijmegen, NetherlandsA. K. GeǐmInstitute for Molecules and Materials, Radboud University Nijmegen, 6525 ED Nijmegen, Netherlands

2008en

ABI

Аннотация

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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Идентификаторы

DOI: 10.1126/science.1154663

Цитирования и источники

Цитирований: 2Использованных источников: 0

Показатели — AkademScholar