Ballistic transmission through a graphene bilayer

被引:142
|
作者
Snyman, I. [1 ]
Beenakker, C. W. J. [1 ]
机构
[1] Leiden Univ, Inst Lorentz, NL-2300 RA Leiden, Netherlands
来源
PHYSICAL REVIEW B | 2007年 / 75卷 / 04期
关键词
D O I
10.1103/PhysRevB.75.045322
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We calculate the Fermi energy dependence of the (time-averaged) current and shot noise in an impurity-free carbon bilayer (length L < width W), and compare with known results for a monolayer. At the Dirac point of charge neutrality, the bilayer transmits as two independent monolayers in parallel: Both current and noise are resonant at twice the monolayer value, so that their ratio (the Fano factor) has the same 1/3 value as in a monolayer-and the same value as in a diffusive metal. The range of Fermi energies around the Dirac point within which this pseudodiffusive result holds is smaller, however, in a bilayer than in a monolayer (by a factor l(perpendicular to)/L, with l(perpendicular to) the interlayer coupling length).
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页数:6
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