高压下Td-WTe2单晶体材料的拉曼光谱研究

李东飞 张可为 里佐威 刘承志 郭瑞 孙成林 李海波

李东飞, 张可为, 里佐威, 刘承志, 郭瑞, 孙成林, 李海波. 高压下Td-WTe2单晶体材料的拉曼光谱研究[J]. 高压物理学报, 2016, 30(5): 369-374. doi: 10.11858/gywlxb.2016.05.004
引用本文: 李东飞, 张可为, 里佐威, 刘承志, 郭瑞, 孙成林, 李海波. 高压下Td-WTe2单晶体材料的拉曼光谱研究[J]. 高压物理学报, 2016, 30(5): 369-374. doi: 10.11858/gywlxb.2016.05.004
LI Dong-Fei, ZHANG Ke-Wei, LI Zuo-Wei, LIU Cheng-Zhi, GUO Rui, SUN Cheng-Lin, LI Hai-Bo. High Pressure Raman Investigation of Td-WTe2 Bulk Single Crystal[J]. Chinese Journal of High Pressure Physics, 2016, 30(5): 369-374. doi: 10.11858/gywlxb.2016.05.004
Citation: LI Dong-Fei, ZHANG Ke-Wei, LI Zuo-Wei, LIU Cheng-Zhi, GUO Rui, SUN Cheng-Lin, LI Hai-Bo. High Pressure Raman Investigation of Td-WTe2 Bulk Single Crystal[J]. Chinese Journal of High Pressure Physics, 2016, 30(5): 369-374. doi: 10.11858/gywlxb.2016.05.004

高压下Td-WTe2单晶体材料的拉曼光谱研究

doi: 10.11858/gywlxb.2016.05.004
基金项目: 

国家自然科学基金 11104106

国家自然科学基金 11373047

中国博士后科学基金 2013M541286

吉林省科技厅青年基金 20140520109JH

吉林省科技厅国际科技合作项目 20150414003GH

吉林省教育厅“十二五”科学技术研究项目 吉教科合字[2015]第211号

详细信息
    作者简介:

    李东飞(1985-), 男, 博士, 主要从事高压光谱研究.E-mail:goodldf@126.com

    通讯作者:

    李海波(1962-), 男, 博士, 主要从事无机纳米功能材料研究.E-mail:lihaibo@jlnu.edu.cn

  • 中图分类号: O521.2

High Pressure Raman Investigation of Td-WTe2 Bulk Single Crystal

  • 摘要: 采用入射方向平行于晶体c轴的532 nm激光作为激发光源,测量了Td-WTe2单晶体材料在0~17.0 GPa压力下的拉曼光谱,并结合第一性原理计算,对常温常压下Td-WTe2单晶体材料的拉曼振动模式进行了分析。实验结果表明:随着压力的增加,层间振动模式对应的拉曼峰峰位随压力移动的速度比层内振动模式快,即压力对层间振动模式的影响强于层内振动模式;位于79.0 cm-1的拉曼峰归属为层间振动模式,与其他层间振动模式不同,其受压力的影响是所有振动模式中最弱的。最后,分析并讨论了压力对Td-WTe2单晶体材料的层间和层内振动模式的影响。

     

  • 图  Td-WTe2单晶体材料的高压实验示意图(放大图显示DAC压腔中Td-WTe2单晶体材料的结构)

    Figure  1.  Schematic diagram of Td-WTe2 bulk single crystal in the DAC chamber (The enlarged part shows the structure of Td-WTe2 bulk single crystal in the DAC chamber)

    图  常温常压下用532 nm激光沿着晶体c轴方向激发获得的Td-WTe2单晶体材料的拉曼光谱

    Figure  2.  Raman spectrum of Td-WTe2 bulk single crystal sample with the incident laser (532 nm) beam direction parallel to the c axis at ambient temperature and pressure

    图  Td-WTe2单晶体材料的拉曼振动模式

    Figure  3.  Raman-active vibrational modes of Td-WTe2 bulk single crystal

    图  Td-WTe2单晶体材料样品的高压拉曼光谱

    Figure  4.  High pressure Raman spectra of Td-WTe2 bulk single crystal sample

    图  Td-WTe2单晶体材料样品的拉曼峰位置随压力变化的关系

    Figure  5.  Pressure dependence of Raman peak positions of Td-WTe2 bulk single crystal sample

    表  1  常温常压下Td-WTe2单晶体材料拉曼活性声子模的理论计算结果和实验结果对比

    Table  1.   Comparison of the calculated and experimental Raman active phonon modes of Td-WTe2 bulk single crystal sample at ambient temperature and pressure

    No. Symmetry Raman shift/(cm-1) Activity
    Calc. Expt.
    1 A1 8.00 Raman, IR
    2 B2 21.22 Raman, IR
    3 A1 24.91 Raman, IR
    4 A1 75.57 79.0 Raman, IR
    5 B2 83.90 Raman, IR
    6 B1 84.86 Raman, IR
    7 A2 85.59 88.4 Raman
    8 A2 108.58 109.7 Raman
    9 B1 108.67 Raman, IR
    10 A2 111.18 113.9 Raman
    11 B1 112.11 Raman, IR
    12 A2 112.51 Raman
    13 B2 116.54 Raman, IR
    14 B2 122.09 Raman, IR
    15 B2 126.73 Raman, IR
    16 A1 127.57 130.8 Raman, IR
    17 A1 128.65 Raman, IR
    18 B2 130.78 Raman, IR
    19 A1 131.51 Raman, IR
    20 A2 152.05 Raman
    21 B1 152.61 Raman, IR
    22 B2 156.24 Raman, IR
    23 A1 158.21 160.8 Raman, IR
    24 A2 158.65 Raman
    25 B1 158.91 Raman, IR
    26 B2 167.91 Raman, IR
    27 A1 169.30 Raman, IR
    28 B2 205.09 Raman, IR
    29 A1 205.12 207.5 Raman, IR
    30 B2 209.85 Raman, IR
    31 A1 211.07 Raman, IR
    32 B2 232.16 Raman, IR
    33 A1 232.24 Raman, IR
    Note:IR means infrared activity.
    下载: 导出CSV

    表  2  Td-WTe2单晶体材料的拉曼峰峰位随着压力变化的线性拟合参数

    Table  2.   Fitting parameters for the Raman peak positions of Td-WTe2 bulk single crystal at different pressures

    Raman shift/(cm-1) Fitted slope Correlation coefficient
    79.0 0.32 0.86
    88.4 1.13 0.94
    109.7 1.09 0.97
    130.8 1.50 0.98
    160.8 2.33 0.99
    207.5 1.68 0.99
    下载: 导出CSV
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  • 收稿日期:  2016-01-11
  • 修回日期:  2016-02-24

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