石墨烯光电导的非微扰准经典理论
Nonperturbative quasiclassical theory of graphene photoconductivity
摘要：
我们提出了一个非微扰准经典理论的石墨烯光电导。我们考虑了低频（微波，太赫兹，中红外）辐射对均匀石墨烯层的静态电导率的影响，并计算了其光电导作为频率，极化和外部交流电场强度的函数，以及材料特性（电子密度，散射时间）和温度。该理论在频率$\hbarω\lesssim 2E_F$和任意强的交流电场下是有效的。我们将所得结果与三阶微扰理论的结果进行了比较，并确定了微扰解的适用范围。
英文摘要：
We present a nonperturbative quasi-classical theory of graphene photoconductivity. We consider the influence of low-frequency (microwave, terahertz, mid-infrared) radiation on the static conductivity of a uniform graphene layer and calculate its photoconductivity as a function of frequency, polarization and strength of the external ac electric field, as well as on the material properties (electron density, scattering time) and temperature. The theory is valid at frequencies $\hbarω\lesssim 2E_F$ and at arbitrarily strong ac electric fields. We compare our results with those of the third-order perturbation theory and determine the applicability range of the perturbative solutions.
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