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New selection rule of resonant raman scattering in MoS_(2) monolayer under circular polarization

Journal of Materials Science & Technology 2022年第7期102卷 132-136页

作者： Jianqi Huang Zhiyong Liu Teng Yang Zhidong Zhang Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China

The first-order resonant raman spectra of monolayer MoS_(2)are calculated under the circularly polarized *** anomalously nonzero raman intensity of the in-plane E mode under the Z(σ+σ+)Zor Z(σ−σ−)Zgeometry,which goes against the conventional selection rule,appears under some circum-stances when optical absorption occurs at some special reciprocal points between the zone-center Γ and the zone-edge-center M *** that moment,the valley selectivity to the circular polarization is *** analysis shows that the anomalous raman intensity of the E mode for the same circularly polarized incident and scattered light is consistent with the pseudo-angular-momentum conservation *** cal-culated E raman tensor of monolayer MoS_(2)is found to vary with laser *** two diagonal terms of the raman tensor change their signs from mutually opposite to the same when the relative intensity of the in-plane E mode to the out-of-plane A'_(1)mode increases,indicating the increasingly important role played by the Frölich-type electron-phonon interaction over the deformation *** study may shed new light on the understanding of the novel electron-photon process and assist in the design of new type of optoelectronic devices.

关键词： First principles calculation resonant raman Helicity selection rule MoS2 monolayer

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raman Scattering at resonant or Near-resonant Conditions： A Generalized Short-Time Approximation

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Chinese Journal of Chemical Physics 2012年第1期25卷 31-47,I0003页

作者： Abdelsalam Mohammed 孙玉萍苗泉 Hans Agren Faris Gel＇mukhanov 瑞典皇家理工学院生物技术系理论化学组 S-10691斯德哥尔摩山东理工大学理学院淄博255049 山东师范大学物理与电子科学学院济南250014

We investigate the dynamics of resonant raman scattering in the course of the frequency de- tuning. The dephasing in the time domain makes the scattering fast when the photon energy is tuned from the absorption resonance. This makes frequency detuning to act as a camera shutter with a regulated scattering duration and provides a practical tool of controlling the scattering time in ordinary stationary measurements. The theory is applied to resonant raman spectra of a couple of few-mode model systems and to trans-1,3,5-hexatriene and guanine-cytosine （G-C） Watson-Crick base pairs （DNA） molecules. Besides some particular physical effects, the regime of fast scattering leads to a simplification of the spectrum as well as to the scattering theory itself. Strong overtones appear in the raman spectra when the photon frequency is tuned in the resonant region, while in the mode of fast scattering, the overtones are gradually quenched when the photon frequency is tuned more than one vibra- tional quantum below the first absorption resonance. The detuning from the resonant region thus leads to a strong purification of the raman spectrum from the contamination by higher overtones and soft modes and purifies the spectrum also in terms of avoidance of dissociation and interfering fluorescence decay of the resonant state. This makes frequency detuning a very useful practical tool in the analysis of the resonant raman spectra of complex systems and considerably improves the prospects for using the raman effect for detection of foreign substances at ultra-low concentrations.

关键词： resonant raman Scattering duration Hexatriene Short time approximation

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