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Helicity-dependent terahertz emission spectroscopy of topological insulator S b2 T e3 thin films

Tu, Chien Ming LU ; Chen, Yi Cheng; Huang, Ping; Chuang, Pei Yu; Lin, Ming Yu; Cheng, Cheng Maw; Lin, Jiunn Yuan; Juang, Jenh Yih; Wu, Kaung Hsiung and Huang, Jung Chun A., et al. (2017) In Physical Review B 96(19).
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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publication status
published
subject
in
Physical Review B
volume
96
issue
19
publisher
American Physical Society
external identifiers
  • scopus:85038847735
  • wos:000414397500004
ISSN
2469-9950
DOI
10.1103/PhysRevB.96.195407
language
English
LU publication?
yes
id
aba55aac-5940-4c3a-abec-5aaf93b17ed0
date added to LUP
2018-01-04 10:51:33
date last changed
2018-01-16 13:29:10
@article{aba55aac-5940-4c3a-abec-5aaf93b17ed0,
  abstract     = {<p>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.</p>},
  articleno    = {195407},
  author       = {Tu, Chien Ming and Chen, Yi Cheng and Huang, Ping and Chuang, Pei Yu and Lin, Ming Yu and Cheng, Cheng Maw and Lin, Jiunn Yuan and Juang, Jenh Yih and Wu, Kaung Hsiung and Huang, Jung Chun A. and Pong, Way Faung and Kobayashi, Takayoshi and Luo, Chih Wei},
  issn         = {2469-9950},
  language     = {eng},
  month        = {11},
  number       = {19},
  publisher    = {American Physical Society},
  series       = {Physical Review B},
  title        = {Helicity-dependent terahertz emission spectroscopy of topological insulator S b<sub>2</sub> T e<sub>3</sub> thin films},
  url          = {http://dx.doi.org/10.1103/PhysRevB.96.195407},
  volume       = {96},
  year         = {2017},
}