拉曼光谱
各向异性
相变
环境压力
凝聚态物理
声子
光致发光
材料科学
相(物质)
对称(几何)
密度泛函理论
化学
光学
光电子学
计算化学
物理
热力学
有机化学
几何学
数学
作者
Xuerui Cheng,Zhanbiao Huangfu,Junbo Wang,Huanjun Zhang,Shiquan Feng,Yongfu Liang,Xiang Zhu,Zheng Wang,Xiaojuan Wu,Kun Yang
标识
DOI:10.1016/j.jallcom.2023.172636
摘要
Pressure is believed to be one effective method to modify the structure and properties of 2D materials. In the present work, the structural transition and anisotropic properties of γ-InSe were in situ investigated under pressure using Raman, photoluminescence and infrared spectra, as well as the density functional theory. Results reveal that γ-InSe would transform to one metallic phase of InSe-III above 11.4 GPa. Below this transition pressure, γ-InSe completely transforms to the high temperature high pressure phase of InSe-II after three pressure up-down cycles. This is the first report on InSe-II obtained at ambient temperature. Besides phase transitions, one direct-to-indirect band transition is observed around 4 GPa. Angle-resolved polarized Raman spectra show all its three phonon modes exhibit 90° periodic variations, yielding a 4-fold symmetry. Pressure would not change its 4-fold symmetry, but its polarized angles vary with pressure. Therefore, pressure has important effect on γ-InSe that induces its structure change and thus results in its optical anisotropy variation.
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