journal article·2020-08-25

Characterization of Excitonic Nature in Raman Spectra Using Circularly Polarized Light

Yan Zhao, Shishu Zhang, Yuping Shi, Yanfeng Zhang, Riichiro Saito, Jin Zhang, Lianming Tong

ACS Nano· Volume 14· Issue 8
Publisher page

Abstract

We propose a technique of Raman spectroscopy to characterize the excitonic nature and to evaluate the relative contribution of the two kinds of electron/exciton–phonon interactions that are observed in two-dimensional transition-metal dichalcogenides (TMDCs). In the TMDCs, the electron/exciton–phonon interactions mainly originate from the deformation potential (DP) or the Fröhlich interaction (FI) which give the mutually different Raman tensors. Using a circularly polarized light, the relative proportion of the DP and the FI can be defined by the ratio of helicity-polarized intensity that is observed by MoS 2 . By this analysis, we show that the excitonic FI interaction gradually increases with decreasing temperature, contributes equally to DP at ∼230 K, and dominates at lower temperatures. The excitonic effect in the Raman spectra is confirmed by modulating the dielectric environment for the exciton and by changing the laser power.
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Research context

OpenAlex topics: 2D Materials and Applications · Perovskite Materials and Applications · Ga2O3 and related materials

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Academy for Advanced Interdisciplinary Studies, Peking University, Beijing 100871, P.R. China

Center for Nanochemistry, Beijing Science and Engineering Center for Nanocarbons, Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P.R. China

Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing 100871, China

Department of Physics, Tohoku University, Sendai 980-8578, Japan

Funding

Ministry of Science and Technology of the People's Republic of China · Japan Society for the Promotion of Science · National Natural Science Foundation of China · Beijing National Laboratory for Molecular Sciences

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