期刊
PHYSICAL REVIEW B
卷 103, 期 3, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.103.035414
关键词
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资金
- NSF [DMR-1552220, DMR-1955889, CMMI-1933214]
- European Union Horizon 2020 research and innovation programme [820423]
- Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany's Excellence Strategy - MCQST [EXC-2111]
- Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany's Excellence Strategy - e-Conversion [EXC-2089]
- International Max Planck Research School for Quantum Science and Technology (IMPRSQST)
- Alexander von Humboldt Foundation
- Bayerische Akademie der Wissenschaften
- DGTIC-UNAM Supercomputing Center [LANCAD-UNAM-DGTIC-359]
Janus transition metal dichalcogenides exhibit additional features compared to ordinary TMDs, and Raman spectroscopy is crucial in monitoring synthesis processes. The study of Janus monolayers' Raman spectra is essential for assessing crystal quality and defect concentration.
Janus transition metal dichalcogenides (TMDs) lose the horizontal mirror symmetry of ordinary TMDs, leading to the emergence of additional features, such as native piezoelectricity, Rashba effect, and enhanced catalytic activity. While Raman spectroscopy is an essential nondestructive, phase- and composition-sensitive tool to monitor the synthesis of materials, a comprehensive study of the Raman spectrum of Janus monolayers is still missing. Here, we discuss the Raman spectra of WSSe and MoSSe measured at room and cryogenic temperatures, near and off resonance. By combining polarization-resolved Raman data with calculations of the phonon dispersion and using symmetry considerations, we identify the four first-order Raman modes and higher-order two-phonon modes. Moreover, we observe defect-activated phonon processes, which provide a route toward a quantitative assessment of the defect concentration and, thus, the crystal quality of the materials. Our work establishes a solid background for future research on material synthesis, study, and application of Janus TMD monolayers.
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