论文标题
通过红外共振拉曼光谱探测石墨烯中的电子音波耦合
Probing enhanced electron-phonon coupling in graphene by infrared resonance Raman spectroscopy
论文作者
论文摘要
我们在石墨烯上以激发光子能量低至1.16 eV的谐振拉曼光谱测量结果，以研究低能载体如何与晶格振动相互作用。由于激发能量靠近Dirac Point的$ \ Mathbf {K} $，我们公布了双共振2D和2D $^\ prime $ peacs之间的强度比的巨大增加，相对于在石墨中测得的峰。与完全\ textIt {ab intib}理论计算相比，我们得出的结论是，观察结果是通过电子和布里素区域 - 边界光子声子之间增强的，动量依赖的耦合来解释的。这一发现适用于二维迪拉克系统，并对在室温下运行的石墨烯设备的运输建模产生重要影响。
We report on resonance Raman spectroscopy measurements with excitation photon energy down to 1.16 eV on graphene, to study how low-energy carriers interact with lattice vibrations. Thanks to the excitation energy close to the Dirac point at $\mathbf{K}$, we unveil a giant increase of the intensity ratio between the double-resonant 2D and 2D$^\prime$ peaks with respect to that measured in graphite. Comparing with fully \textit{ab initio} theoretical calculations, we conclude that the observation is explained by an enhanced, momentum-dependent coupling between electrons and Brillouin zone-boundary optical phonons. This finding applies to two dimensional Dirac systems and has important consequences for the modeling of transport in graphene devices operating at room temperature.
