文章基本信息

标题：Optically detecting the edge-state of a three-dimensional topological insulator under ambient conditions by ultrafast infrared photoluminescence spectroscopy
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作者：Shun-ya Maezawa ; Hiroshi Watanabe ; Masahiro Takeda 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2015
卷号：5
期号：1
DOI：10.1038/srep16443
语种：English
出版社：Springer Nature
摘要：Ultrafast infrared photoluminescence spectroscopy was applied to a three-dimensional topological insulator TlBiSe₂ under ambient conditions. The dynamics of the luminescence exhibited bulk-insulating and gapless characteristics bounded by the bulk band gap energy. The existence of the topologically protected surface state and the picosecond-order relaxation time of the surface carriers, which was distinguishable from the bulk response, were observed. Our results provide a practical method applicable to topological insulators under ambient conditions for device applications.