標題: Helicity-dependent terahertz emission spectroscopy of topological insulator Sb2Te3 thin films
作者: Tu, Chien-Ming
Chen, Yi-Cheng
Huang, Ping
Chuang, Pei-Yu
Lin, Ming-Yu
Cheng, Cheng-Maw
Lin, Jiunn-Yuan
Juang, Jenh-Yih
Wu, Kaung-Hsiung
Huang, Jung-Chun A.
Pong, Way-Faung
Kobayashi, Takayoshi
Luo, Chih-Wei
電子物理學系
物理研究所
Department of Electrophysics
Institute of Physics
公開日期: 6-Nov-2017
摘要: We report on helicity-dependent terahertz emissions that originate from the helicity-dependent photocurrents in topological insulator Sb2Te3 thin films due to ultrafast optical excitation. The polarity of the emitted terahertz radiation is controlled by both the incident angle and the helicity of optical pulses. Using an unprecedented decomposition-recombination procedure in the time domain, the signals of the Dirac fermions are fully separated from bulk contributions. These results provide insights into the optical coupling of topological surface states and open up opportunities for applying helicity-dependent terahertz emission spectroscopy in spintronics.
URI: http://dx.doi.org/10.1103/PhysRevB.96.195407
http://hdl.handle.net/11536/144028
ISSN: 2469-9950
DOI: 10.1103/PhysRevB.96.195407
期刊: PHYSICAL REVIEW B
Volume: 96
Issue: 19
起始頁: 0
結束頁: 0
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