本征石墨烯的光电导特性
Photoconductivity of an intrinsic graphen
摘要：
我们研究了在低温下与远红外和中红外辐射相关的本征石墨烯的光电导性。该模型考虑了入射辐射对电子-空穴对的激发、热辐射引起的带间生成-复合跃迁和声学声子散射引起的带内能量弛豫。假设动量弛豫是由弹性散射引起的。相关的碰撞积分适用于与纵向声模和热辐射相互作用的载流子的无质量能谱的情况。研究发现，光电导是由弱能量弛豫和产生-复合过程的相互作用决定的。因此，非线性响应的阈值相当低。
英文摘要：
We examine the photoconductivity of an intrinsic graphene associated with far- and mid-infrared irradiation at low temperatures. The model under consideration accounts for the excitation of the electron-hole pairs by incident radiation, the interband generation-recombination transitions due to thermal radiation, and the intraband energy relaxation due to acoustic phonon scattering. The momentum relaxation is assumed to be caused by elastic scattering. The pertinent collision integrals are adapted for the case of the massless energy spectrum of carriers that interact with the longitudinal acoustic mode and the thermal radiation. It is found that the photoconductivity is determined by an interplay between weak energy relaxation and generation-recombination processes. Due to this the threshold of nonlinear response is fairly low.
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