Transport conductivity of graphene at RF and microwave frequencies
Transport conductivity of graphene at RF and microwave frequencies
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DOI：
10.1088/2053-1583/3/1/015010
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发表时间：
2016-03-01
期刊：
影响因子：
5.5
通讯作者：
Ferrari, A. C.
中科院分区：
文献类型：
--
作者：
Awan, S. A.;Lombardo, A.;Ferrari, A. C.
我们测量石墨烯共面波导从直流电（DC）到频率积分= 13.5 GHz，并表明表观电阻（存在寄生阻抗时）具有Ω（2）依赖性（其中Ω = 2 π f），但固有电导率（无寄生阻抗影响）与频率无关。因此，在我们的设备中，复交流电的真实的部分。(AC)电导率与DC值相同，虚部类似于0。石墨烯通道被建模为平行的磁阻-电容网络，其频率依赖性与具有类似于2.1 ps的动量弛豫时间的Drude电导率相同，突出了AC电子输运对石墨烯的电磁性质的影响。这可以导致高速模拟场效应晶体管、混频器、倍频器、低噪声放大器和辐射探测器的优化设计。
We measure graphene coplanar waveguides from direct current (DC) to a frequency integral = 13.5 GHz and show that the apparent resistance (in the presence of parasitic impedances) has an omega(2) dependence (where omega = 2 pi f), but the intrinsic conductivity (without the influence of parasitic impedances) is frequency-independent. Consequently, in our devices the real part of the complex alternating current. (AC) conductivity is the same as the DC value and the imaginary part is similar to 0. The graphene channel is modeled as a parallel resistive-capacitive network with a frequency dependence identical to that of the Drude conductivity with momentum relaxation time similar to 2.1 ps, highlighting the influence of AC electron transport on the electromagnetic properties of graphene. This can lead to optimized design of high-speed analog field-effect transistors, mixers, frequency doublers, low-noise amplifiers and radiation detectors.