Helicity-dependent terahertz emission spectroscopy of topological insulator S b 2 T e 3 thin films

Chien Ming Tu*, Yi Cheng Chen, Ping Huang, Pei Yu Chuang, Ming Yu Lin, Cheng Maw Cheng, Jiunn Yuan Lin, Jenh Yih Juang, Kaung-Hsiung Wu, Jung Chun A. Huang, Way Faung Pong, Takayoshi Kobayashi, Chih Wei Luo

*此作品的通信作者

研究成果: Article同行評審

15 引文 斯高帕斯(Scopus)

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.

原文English
文章編號195407
期刊Physical Review B
96
發行號19
DOIs
出版狀態Published - 6 11月 2017

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