Electron-phonon interactions in MoS2 probed with ultrafast two-dimensional visible/far-infrared spectroscopy,The Journal of Chemical Physics

当前位置： X-MOL 学术 › J. Chem. Phys. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Electron-phonon interactions in MoS2 probed with ultrafast two-dimensional visible/far-infrared spectroscopy
The Journal of Chemical Physics ( IF 3.1 ) Pub Date : 2015-05-22 14:03:30 , DOI: 10.1063/1.4921573
Xunmin Guo ₁ , Hailong Chen ₁ , Xiewen Wen ₁ , Junrong Zheng ₁

Affiliation

An ultrafast two-dimensional visible/far-IR spectroscopy based on the IR/THz air biased coherent detection method and scanning the excitation frequencies is developed. The method allows the responses in the far-IR region caused by various electronic excitations in molecular or material systems to be observed in real time. Using the technique, the relaxation dynamics of the photo-excited carriers and electron/phonon coupling in bulk MoS₂ are investigated. It is found that the photo-generation of excited carriers occurs within two hundred fs and the relaxation of the carriers is tens of ps. The electron-phonon coupling between the excitations of electrons and the phonon mode E_1u of MoS₂ is also directly observed. The electron excitation shifts the frequency of the phonon mode 9 cm⁻¹ higher, resulting in an absorption peak at 391 cm⁻¹ and a bleaching peak at 382 cm⁻¹. The frequency shift diminishes with the relaxation of the carriers.

中文翻译：

超快二维可见/远红外光谱探测MoS2中的电子-声子相互作用

开发了基于红外/太赫兹空气偏置相干检测方法并扫描激发频率的超快速二维可见/远红外光谱。该方法允许实时观察由分子或材料系统中的各种电子激发引起的远红外区域中的响应。利用该技术，研究了本体MoS ₂中光激发载流子的弛豫动力学和电子/声子耦合。发现激发载流子的光生发生在200 fs之内，载流子的弛豫为几十ps。电子激发与MoS ₂的声子模式E _1u之间的电子-声子耦合也可以直接观察到。电子激发使声子模的频率高出9 cm ^-1，从而在391 cm ^-1处出现吸收峰，在382 cm ^-1处出现漂白峰。频移随着载波的松弛而减小。

更新日期：2015-05-23

点击分享查看原文

点击收藏

公开下载

阅读更多本刊新发论文