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A graphene quantum dot realized by an armchair graphene nanoribbon with line defect
Author(s) -
Sui XiaoYan,
Li ZhiChao,
Gong WeiJiang,
Yu GuoDong,
Chen XiaoHui
Publication year - 2013
Publication title -
physica status solidi (rrl) – rapid research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.786
H-Index - 68
eISSN - 1862-6270
pISSN - 1862-6254
DOI - 10.1002/pssr.201307152
Subject(s) - graphene , quantum dot , quantum tunnelling , condensed matter physics , coupling (piping) , quantum point contact , conductance , electron , line (geometry) , graphene nanoribbons , graphene quantum dot , physics , materials science , transistor , nanotechnology , quantum mechanics , quantum well , voltage , laser , geometry , mathematics , metallurgy
Abstract The electron transport in a semiconducting armchair graphene nanoribbon with line defect is theoretically investigated, by coupling it to two normal metallic leads. It is found that the line defect induces a new localized quantum state near the Dirac point, and that the coupling between this state and the leads provides a channel for the resonant tunneling. This means that such a finite‐size nanoribbon can be viewed as a quantum dot. When two line defects are present simultaneously, a coupled quantum dot forms, leading to the splitting of the conductance peaks. With these results, we propose such a structure to be a promising candidate of an electron transistor. (© 2013 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)