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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

26 Scopus citations

Abstract

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.

Original languageEnglish
Article number195407
JournalPhysical Review B
Volume96
Issue number19
DOIs
StatePublished - 6 Nov 2017

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