期刊
CRYSTALS
卷 8, 期 2, 页码 -出版社
MDPI
DOI: 10.3390/cryst8020074
关键词
GaTe; lattice vibration; crystal structure; Davydov splitting
资金
- National Key R&D Program of China [2016YFB0402405, 2016YFF0101301]
- National Natural Science Foundations of China [51672216]
- research fund of the State Key Laboratory of solidification processing (NWPU) [94-QZ-2014, SKLSP201612]
- Fundamental Research Funds for the Central Universities [G2016KY0104, 3102016ZY011]
- 111 Project of China [B08040]
- State Key Laboratory for Mechanical Behaviour of Materials
- China Scholarship Council (CSC) [201700290035, 201706965048]
The effect of interlayer interaction on in-layer structure of laminar GaTe crystals was studied according to the lattice vibration using micro-Raman analysis. The results were also confirmed by the first principle calculations. Accordingly, the relationship between lattice vibration and crystal structure was established. Ten peaks were observed in the micro-Raman spectra from 100 cm(-1) to 300 cm(-1). Eight of them fit Raman-active vibration modes and the corresponding displacement vectors were calculated, which proved that the two modes situated at 128.7 cm(-1) and 145.7 cm(-1) were related to the lattice vibration of GaTe, instead of impurities or defects. Davydov splitting in GaTe was identified and confirmed by the existence of the other two modes, conjugate modes, at 110.7 cm(-1) ( Delta omega = 33.1 cm(-1)) and 172.5 cm(-1) (Delta omega = 49.5 cm(-1)), indicates that the weak interlayer coupling has a significant effect on lattice vibrations in the two-layer monoclinic unit cell. Our results further proved the existence of two layers in each GaTe unit cell.
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