声子
激光线宽
凝聚态物理
非谐性
拉曼光谱
石墨烯
大气温度范围
材料科学
物理
拉曼散射
电子
纳米技术
光学
量子力学
气象学
激光器
作者
Zherui Han,Xiaolong Yang,Sean Sullivan,Tianli Feng,Li Shi,Wu Li,Xiulin Ruan
标识
DOI:10.1103/physrevlett.128.045901
摘要
The Raman peak position and linewidth provide insight into phonon anharmonicity and electron-phonon interactions in materials. For monolayer graphene, prior first-principles calculations have yielded decreasing linewidth with increasing temperature, which is opposite to measurement results. Here, we explicitly consider four-phonon anharmonicity, phonon renormalization, and electron-phonon coupling, and find all to be important to successfully explain both the G peak frequency shift and linewidths in our suspended graphene sample over a wide temperature range. Four-phonon scattering contributes a prominent linewidth that increases with temperature, while temperature dependence from electron-phonon interactions is found to be reversed above a doping threshold (ℏω_{G}/2, with ω_{G} being the frequency of the G phonon).
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