Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2011-08-08
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
13 pages, 7 figures
Scientific paper
In present work, we theoretically study the electron wave's focusing phenomenon in a single layered graphene pn junction(PNJ) and obtain the electric current density distribution of graphene PNJ, which is in good agreement with the qualitative result in previous numerical calculations [Science, 315, 1252 (2007)]. In addition, we find that for symmetric PNJ, 1/4 of total electric current radiated from source electrode can be collected by drain electrode. Furthermore, this ratio reduces to 3/16 in a symmetric graphene npn junction. Our results obtained by present analytical method provide a general design rule for electric lens based on negative refractory index systems.
Mu Weihua
Ou-Yang Zhong-can
Tang Yunqing
Zhang Gang
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