论文标题
第三次谐波生成石墨烯的多体效应
Many-Body Effects in Third Harmonic Generation of Graphene
论文作者
论文摘要
Terahertz制度中第三次谐波石墨烯的低能（内标）范围受相互作用引起的阻尼项的控制。因此，对散射过程的多体描述是一个引人注目的和理想的要求。在本文中，使用Kadanoff-Baym方法，我们系统地研究了多体相互作用对石墨烯的第三谐波产生（THG）的影响，以弹性杂质散射为基准示例。 We predict the onset in the mixed inter-intraband regime of novel incoherent features driven by the interaction at four- and five-photon transition frequencies in the third-harmonic optical conductivity with a spectral weight proportional to the scattering rate.We show also that, in spite of the complex many-body physics, the purely intraband term governing the limit $ω\to 0$ resembles the constraints of the phenomenological model.我们将此协议归因于履行保护方法执行的保护法。与新型不连贯的特征的重叠以及多体驱动的多光子顶点耦合的影响限制了现象学描述的有效性。
The low-energy (intraband) range of the third harmonic generation of graphene in the terahertz regime is governed by the damping terms induced by the interactions. A controlled many-body description of the scattering processes is thus a compelling and desirable requirement. In this paper, using a Kadanoff-Baym approach, we systematically investigate the impact of many-body interaction on the third-harmonic generation (THG) of graphene, taking elastic impurity scattering as a benchmark example. We predict the onset in the mixed inter-intraband regime of novel incoherent features driven by the interaction at four- and five-photon transition frequencies in the third-harmonic optical conductivity with a spectral weight proportional to the scattering rate.We show also that, in spite of the complex many-body physics, the purely intraband term governing the limit $ω\to 0$ resembles the constraints of the phenomenological model. We ascribe this agreement to the fulfilling of the conservation laws enforced by the conserving approach. The overlap with novel incoherent features and the impact of many-body driven multi-photon vertex couplings limit however severely the validity of phenomenological description.
