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The effects of impurity doping on the optical properties of biased bilayer graphene

机译：杂质掺杂对偏压双层石墨烯光学性能的影响

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摘要

We address the optical conductivity of doped AA-stacked bilayer graphene in the presence of a finite bias voltage at finite temperature. The effect of scattering by dilute charged impurities is discussed in terms of the self-consistent Born approximation. Green's function approach has been implemented to find the behavior of optical conductivity of bilayer graphene within linear response theory. We have found the frequency dependence of optical conductivity for different values of concentration and scattering strength of dopant impurity. Also the dependence of optical conductivity on the impurity concentration and bias voltage has been investigated in details. A peak appears in the plot of optical conductivity versus impurity concentration for different values of chemical potential. Furthermore we find optical conductivity reduces with frequency for any impurity concentration and scattering strength. (C) 2016 Elsevier B.V. All rights reserved.
机译：我们解决了在有限温度下存在有限偏置电压的情况下掺杂AA堆叠的双层石墨烯的光导率。根据自洽的Born近似讨论了稀释的带电杂质引起的散射效应。格林函数方法已被实施以在线性响应理论中发现双层石墨烯的光导行为。我们发现了掺杂剂杂质的不同浓度和散射强度值对光导率的频率依赖性。还详细研究了光导率对杂质浓度和偏置电压的依赖性。对于不同的化学势值，在光导率与杂质浓度的关系图中出现一个峰值。此外，我们发现对于任何杂质浓度和散射强度，光导率均随频率降低。 （C）2016 Elsevier B.V.保留所有权利。

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