Calculation of current density for graphene superlattice in a constant electric field

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• 作者：Farhad Sattari (1)
  
  1. Faculty of Sciences ; Department of Physics ; University of Mohaghegh Ardabili ; P.O. Box 179 ; Ardabil ; Iran
  
• 关键词：Graphene superlattice ; Electrical transport ; Electric field ; Current density
• 刊名：Journal of Theoretical and Applied Physics
• 出版年：2015
• 出版时间：March 2015
• 年：2015
• 卷：9
• 期：1
• 页码：81-87
• 全文大小：1,121 KB
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• 刊物主题：Theoretical, Mathematical and Computational Physics;
• 出版者：Springer Berlin Heidelberg
• ISSN：2251-7235

文摘

Based on the transfer-matrix method, this paper has investigated the electrical transport properties in monolayer and bilayer graphene superlattices modulated by a homogeneous electric field. It is found that the angular range of the transmission probability can be efficiently controlled by the number of barriers. In addition, current density has an oscillatory behavior with respect to external field and Fermi energy. In other words, the current density in monolayer and bilayer graphene superlattices can be controlled by changing either the external field or the Fermi energy. Meanwhile, in the bilayer system unlike monolayer structure the value of current density can be zero. So, for designing electronic devices, bilayer graphene is more efficient.