Anharmonicity of monolayer MoS2, MoSe2, and WSe2: A Raman study under high pressure and elevated temperature

被引：42

作者：

Yang, Mei ^{[1
]}

Cheng, Xuerui ^{[2
]}

Li, Yuanyuan ^{[1
]}

Ren, Yufen ^{[2
]}

Liu, Miao ^{[3
]}

Qi, Zeming ^{[1
]}

机构：

[1] Univ Sci & Technol China, Natl Synchrotron Radiat Lab, Hefei 230029, Anhui, Peoples R China

[2] Zhengzhou Univ Light Ind, Sch Phys & Elect Engn, Zhengzhou 450002, Herts, Peoples R China

[3] Lawrence Berkeley Natl Lab, Energy Technol Area, Berkeley, CA 94720 USA

来源：

APPLIED PHYSICS LETTERS | 2017年 / 110卷 / 09期

基金：

中国国家自然科学基金;

关键词：

TRANSITION-METAL DICHALCOGENIDES; STRUCTURAL TRANSITION; THERMAL-CONDUCTIVITY; LATTICE-DYNAMICS; ATOMIC LAYERS; PHONON SHIFTS; WS2; SCATTERING; MONO;

D O I：

10.1063/1.4977877

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

In this paper, the thermodynamic parameters such as Gruneisen parameters and anharmonicity are investigated utilizing pressure-and temperature-dependent Raman spectroscopy of monolayer transition-metal dichalcogenides MX2 ( M = Mo, W; X = S, Se). The result indicates a good stability of these compounds in the pressure range of 0-9.0 GPa and the temperature range of 175-575 K. It is a general trend that Raman mode varies with temperature and pressure linearly for monolayer MX2, and the thermodynamic Gruneisen parameters can be determined from the temperature-and pressure-dependencies of Raman spectra. Based on these measurable parameters, anharmonic parameters are extracted for each active Raman mode. The result shows that the temperature dependencies of the phonon frequencies are well described by considering the contributions from thermal expansion and lattice anharmonicity. Published by AIP Publishing.

引用

页数：5

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