Helicity-dependent terahertz emission spectroscopy of topological insulator Sb2Te3 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, and Chih-Wei Luo
Phys. Rev. B 96, 195407 – Published 6 November 2017
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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.

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  • Received 31 January 2017
  • Revised 9 October 2017

DOI:https://doi.org/10.1103/PhysRevB.96.195407

©2017 American Physical Society

Physics Subject Headings (PhySH)

  1. Research Areas
Optical generation of spin carriersSpin-orbit couplingSurface statesTopological materials
  1. Physical Systems
Topological insulators
  1. Techniques
Ultrafast pump-probe spectroscopy
Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Chien-Ming Tu1,2,3,*, Yi-Cheng Chen1, Ping Huang1, Pei-Yu Chuang4, Ming-Yu Lin4, Cheng-Maw Cheng5, Jiunn-Yuan Lin6, Jenh-Yih Juang1, Kaung-Hsiung Wu1, Jung-Chun A. Huang4,7,†, Way-Faung Pong2, Takayoshi Kobayashi1,8,9, and Chih-Wei Luo1,7,‡

  • 1Department of Electrophysics, National Chiao Tung University, Hsinchu, Taiwan 300, Republic of China
  • 2Department of Physics, Tamkang University, New Taipei City 25137, Taiwan, Republic of China
  • 3Department of Physics, Lund University, P.O. Box 118, SE-221 00 Lund, Sweden
  • 4Department of Physics and Advanced Optoelectonic Technology Center, National Cheng Kung University, Tainan 701, Taiwan, Republic of China
  • 5National Synchrotron Radiation Research Center, Hsinchu, Taiwan 300, Republic of China
  • 6Institute of Physics, National Chiao Tung University, Hsinchu, Taiwan 300, Republic of China
  • 7Taiwan Consortium of Emergent Crystalline Materials, Ministry of Science and Technology, Taipei 10601, Taiwan, Republic of China
  • 8Advanced Ultrafast Laser Research Center and Department of Engineering Science, The University of Electro-Communications, Chofugaoka 1-5-1, Chofu, Tokyo 182-8585, Japan
  • 9Japan Science and Technology Agency, Core Research for Evolutional Science and Technology (CREST), Japan Science and Technology Agency, K's Gobancho, 7, Gobancho, Chiyoda-ku, Tokyo 102-0076, Japan

  • *cmtu0813@gmail.com
  • †jcahuang@mail.ncku.edu.tw
  • ‡cwluo@mail.nctu.edu.tw

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Vol. 96, Iss. 19 — 15 November 2017

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