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

Tu, Chien Ming (author): Lund University,Lunds universitet,Atomfysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Atomic Physics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH,National Chiao Tung University,Tamkang University

Cheng, Cheng Maw (author): National Synchrotron Radiation Research Center Taiwan

Pong, Way Faung (author)

Kobayashi, Takayoshi (author): Japan Science and Technology Agency (JST),National Chiao Tung University,University of Electro-Communications

(creator_code:org_t)

Related links:: http://dx.doi.org/10...; show more...; https://lup.lub.lu.s...; https://doi.org/10.1...; show less...

Abstract Subject headings

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.

By the author/editor: Tu, Chien Ming; Chen, Yi Cheng; Huang, Ping; Chuang, Pei Yu; Lin, Ming Yu; Cheng, Cheng Maw; show more...; Lin, Jiunn Yuan; Juang, Jenh Yih; Wu, Kaung Hsiung; Huang, Jung Chun ...; Pong, Way Faung; Kobayashi, Takay ...; Luo, Chih Wei; show less...

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Condensed Matter ...

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