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\bibitem{Jiang_etal2017} {\textquotedblleft}\textit{Tuning a circular p-n junction in graphene from quantum confinement to optical guiding}{\textquotedblright}. Jiang Y, Mao J, Moldovan D, Masir MR, Li G, Watanabe K, Taniguchi T, Peeters FM, Andrei EY, Nature nanotechnology \textbf{12}, 1045 (2017).   http://doi.org/10.1038/NNANO.2017.181

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