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Optoelectronic properties of graphene in the presence of optical phonon scattering

机译:声子散射下石墨烯的光电性能

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W. Xu;H. M. Dong;L. L. Li;J. Q. Yao;P. Vasilopoulos;F. M. Peeters;%We study in detail the optoelectronic properties of graphene. Considering the electron interactions with photons and phonons, we employ the mass- and energy-balance equations to self-consistently evaluate the photoinduced carrier densities, the optical conductance, and the transmission coefficient in the presence of a linearly polarized radiation field. We demonstrate that the photoinduced carrier densities increase around the electron-photon-phonon resonant transition. They depend strongly on the radiation intensity and frequency, temperature, and dark carrier density. For short-wavelength radiation (L<3 μm), we obtain the universal optical conductance σ_0=e~2/(4h). Importantly, there exists an optical-absorption window in the radiation wavelength range 4-100 μm, which is induced by different transition energies required for interband and intraband optical absorption. The position and width of this window depend sensitively on the temperature and the carrier density of the system. These theoretical results are in line with recent experimental findings and indicate that graphene exhibits important features not only in the visible regime but also in the midinfrared bandwidth.
机译:徐伟; H。董先生; L。李丽; J。 Q.姚; P。瓦西洛普洛斯; F。 M. Peeters;%我们详细研究了石墨烯的光电性能。考虑到电子与光子和声子的相互作用,我们采用质量平衡和能量平衡方程,在存在线性极化辐射场的情况下,自洽地评估了光诱导的载流子密度,光导和透射系数。我们证明,光致载流子密度在电子-光子-声子共振跃迁附近增加。它们在很大程度上取决于辐射强度,频率,温度和暗载流子密度。对于短波辐射(L <3μm),我们获得了通用光导σ_0= e〜2 /(4h)。重要的是,存在辐射波长范围为4-100μm的光吸收窗,该光吸收窗是由带间和带内光吸收所需的不同跃迁能量引起的。该窗口的位置和宽度敏感地取决于系统的温度和载流子密度。这些理论结果与最近的实验结果一致,表明石墨烯不仅在可见光范围内而且在中红外带宽中都显示出重要的特征。

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