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

doi:10.1103/PhysRevB.96.195407

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 journal › Article › peer-review

21 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 language	English
Article number	195407
Journal	Physical Review B
Volume	96
Issue number	19
DOIs	https://doi.org/10.1103/PhysRevB.96.195407
State	Published - 6 Nov 2017

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10.1103/PhysRevB.96.195407

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

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.",

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

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doi = "10.1103/PhysRevB.96.195407",

language = "English",

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T1 - Helicity-dependent terahertz emission spectroscopy of topological insulator S b 2 T e 3 thin films

AU - Tu, Chien Ming

AU - Chen, Yi Cheng

AU - Huang, Ping

AU - Chuang, Pei Yu

AU - Lin, Ming Yu

AU - Cheng, Cheng Maw

AU - Lin, Jiunn Yuan

AU - Juang, Jenh Yih

AU - Wu, Kaung-Hsiung

AU - Huang, Jung Chun A.

AU - Pong, Way Faung

AU - Kobayashi, Takayoshi

AU - Luo, Chih Wei

PY - 2017/11/6

Y1 - 2017/11/6

N2 - 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.

AB - 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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U2 - 10.1103/PhysRevB.96.195407

DO - 10.1103/PhysRevB.96.195407

M3 - Article

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SN - 2469-9950

VL - 96

JO - Physical Review B

JF - Physical Review B

IS - 19

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ER -

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

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