期刊文献+
共找到1篇文章
< 1 >
每页显示 20 50 100
Breakdown of Raman selection rules by Frohlich interaction in few-layer WS_(2) 被引量:1
1
作者 Qing-Hai Tan Yu-Jia Sun +5 位作者 Xue-Lu Liu Kai-Xuan Xu Yuan-Fei Gao shu-liang ren Ping-Heng Tan Jun Zhang 《Nano Research》 SCIE EI CAS CSCD 2021年第1期239-244,共6页
The polarization selection rule of Raman scattering is crucial in symmetry analysis of elementary excitations in semiconductors and correlated electron systems.Here we reported the observation of breakdown of Raman se... The polarization selection rule of Raman scattering is crucial in symmetry analysis of elementary excitations in semiconductors and correlated electron systems.Here we reported the observation of breakdown of Raman selection rules in few-layer WS_(2) by using resonant Raman spectroscopy.When the excitation energy is close to the dark A exciton state,we observed some infrared active modes and backscattering forbidden modes.Importantly,we found that all observed phonon modes follow the same paralleled-polarization behavior.According to the electron-phonon coupling near the band edge in WS_(2),we proposed a theoretical model based on the intraband Frohlich interaction.In this case,the polarization response of the scattering signal is no longer determined by the original Raman tensor of scattered phonons.Instead,it is determined by a new isotropic Raman tensor that generated from this intraband Frohlich interaction between dark A exciton and phonons.We found that this theoretical model is in excellent agreement with the observed results.The breakdown of Raman selection rules can violate the conventional limitations of the optical response and provide an effective method to control the polarization of Raman scattering signals in two-dimensional materials. 展开更多
关键词 WS_(2) resonant Raman scattering dark exciton Raman section rules Frohlich interaction
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部