Shot noise in graphene with long-range Coulomb interaction and local Fermi distribution

Shot noise in graphene with long-range Coulomb interaction and local Fermi distribution
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石墨烯中具有长程库仑相互作用和局部费米分布的散粒噪声

DOI:
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发表时间:
2009
期刊:
影响因子:
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通讯作者:
B. Horovitz
B. Horovitz
中科院分区:
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文献类型:
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作者:
A. Golub;B. Horovitz

文献摘要

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我们使用基于Keldysh技术的动力学方程方法计算弹道石墨烯中的散粒噪声功率。我们发现,局部能量分布函数服从泊松方程,表明映射到一个扩散金属系统。我们推导了包含长程库仑相互作用的一阶电导和噪声。我们发现,散粒噪声增加,由于相互作用,导致频率依赖性。此外,我们还发现简并态下的Fano因子为1/3,与没有库仑相互作用时的Fano因子相同。
We calculate the shot noise power in ballistic graphene using the kinetic equation approach based on the Keldysh technique. We find that the local energy distribution function obeys Poisson's equation, indicating a mapping into a diffusive metal system. We derive the conductance and noise including the long range Coulomb interaction to first order. We find that the shot noise increases due to interaction, leading to a frequency dependence. Furthermore, we find that the Fano factor at degeneracy is 1/3, the same as without the Coulomb interaction.