Ballistic transmission through a graphene bilayer
Ballistic transmission through a graphene bilayer
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DOI：
10.1103/physrevb.75.045322
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发表时间：
2007-01-01
影响因子：
3.7
通讯作者：
Beenakker, C. W. J.
中科院分区：
文献类型：
--
作者：
Snyman, I.;Beenakker, C. W. J.
我们计算了无杂质碳双层（长L <宽W）中（时间平均）电流和散粒噪声的费米能量依赖性，并与已知的单层结果进行了比较。在电荷中性的狄拉克点，双层膜作为两个平行的独立单层膜传输：电流和噪声都在单层值的两倍处共振，因此它们的比值（法诺因子）与单层中的值相同，也与扩散金属中的值相同。然而，在狄拉克点附近的费米能范围内，这个伪扩散结果成立，在双层中比在单层中小（系数为l（垂直于）/L，其中l（垂直于）是层间耦合长度）。
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).