| CROSS-DISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY |
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Double Resonance Raman Scattering in Single-Layer MoSe$_{2}$ under Moderate Pressure |
| Jian-mei Li1,2, Yi-kun Yao1,2, Li-huan Sun1,2, Xin-yan Shan1, Cong Wang5, Xing-hua Lu1,2,3,4** |
1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190
2School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190
3Center for Excellence in Topological Quantum Computation, Beijing 100190
4Songshan Lake Materials Laboratory, Dongguan 523808
5School of Physics & Mathematical Sciences, Nanyang Technological University, Singapore 639798, Singapore
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| Cite this article: |
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Jian-mei Li, Yi-kun Yao, Li-huan Sun et al 2019 Chin. Phys. Lett. 36 048201 |
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Abstract Pressure-dependent properties in layered transition-dichalcogenides are important for our understanding of their basic structures and applications. We investigate the electronic structure in MoSe$_{2}$ monolayer under external pressure up to 5.73 GPa by Raman spectroscopy and photoluminescence (PL) spectroscopy. The double resonance out-of-plane acoustic mode ($2ZA$) phonon is observed in Raman spectroscopy near 250 cm$^{-1}$, which presents pronounced intensity and pressure dependence. Significant variation in $2ZA$ peak intensity under different pressures reflects the change in electronic band structure as pressure varies, which is consistent with the blue shift in PL spectroscopy. The high sensitivity in both Raman and PL spectroscopy under moderate pressure in such a two-dimensional material may have many advantages for optoelectronic applications.
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Received: 04 December 2018
Published: 23 March 2019
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| PACS: |
82.80.Gk
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(Analytical methods involving vibrational spectroscopy)
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81.40.Vw
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(Pressure treatment)
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| Fund: Supported by the Strategic Priority Research Program (B) of the Chinese Academy of Sciences under Grant Nos XDB30000000, XDB28000000 and XDB07030100, the National Natural Science Foundation of China under Grant Nos 11774395, 11727902 and 91753136, and the Beijing Natural Science Foundation under Grant No 4181003. |
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