摘要
采用入射方向平行于晶体c轴的532nm激光作为激发光源,测量了Td-WTe2单晶体材料在0~17.0GPa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79.0cm-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。
Raman spectra of Td-WTe2 bulk single crystal sample with the incident laser （532 nm） beam direction parallel to the c axis were obtained under＇pressures up to 17 GPa. Based on the first- principles calculations,we analyzed the Raman spectrum of Td-WTe2 bulk single crystal obtained at ambient temperature. The results indicated that the effect of pressure on the out-of-plane vibrational modes is much stronger than the in-plane vibrational modes,except for the 79.0 cm 1 vibrational mode which is assigned to the out-of-plane vibrational mode. The vibrational mode located at 79.0 cm 1 is less sensitive to pressure than the other vibrational modes. Moreover, we gave a detailed analysis and explanation for the effect of pressure on the vibration modes of Td-WTe2 bulk single crystal.
作者
李东飞
张可为
里佐威
刘承志
郭瑞
孙成林
李海波
LI Dong-Fe ZHANG Ke-Wei LI Zuo-Wei LIU Cheng-Zhi GUO Rui SUN Cheng-Lin LI Hai-Bo(Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, Jilin Normal University, Changchun 130103, China State Key Laboratory of Superhard Materials, College of Physics, J ilin University, Changchun 130012, China Changchun Observatory, National Astronomical Observatories, Chinese Academy of Sciences, Changchun 130117, China)
出处
《高压物理学报》
CAS
CSCD
北大核心
2016年第5期369-374,共6页
Chinese Journal of High Pressure Physics
基金
国家自然科学基金(11104106
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)
