期刊
APPLIED SURFACE SCIENCE
卷 501, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2019.144268
关键词
Topological insulators; Nanosheets; Bismuth telluride; Crystal symmetry breaking
类别
资金
- National Natural Science Foundation of China [11404414, 61575225, 11074312, 11374377, 11474174]
- Undergraduate Research Training Program of Minzu University of China [URTP2019110017]
For potential use as a topological insulator, thin square-like Bi2Te3 nanosheets, prepared via a facile solution-based method, were subjected to detailed micro-Raman spectral measurements. The results demonstrate remarkable activation of the infrared active A(1u) mode in the Raman spectra despite the forbidden nature of the odd-parity A(1u) mode for bulk Bi2Te3 crystals. Therefore, the results unambiguously prove the crystal symmetry breaking of the thin square-like Bi2Te3 nanosheets. This study illustrates the potential applicability of microRaman spectroscopy as a powerful nanometrology tool for investigating the optical properties of topological insulators.
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