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- Tu, Chien Ming, et al.
(författare)
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Helicity-dependent terahertz radiation from topological insulator Sb2Te3 thin film by femtosecond optical excitation
- 2016
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Ingår i: 41st International Conference on Infrared, Millimeter and Terahertz Waves, IRMMW-THz 2016. - 9781467384858
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Konferensbidrag (refereegranskat)abstract
- We report on terahertz radiation from topological insulator (TI) Sb2Te3 thin film under ultrafast optical excitation with different helicity. Polarity-reversals of the emitted THz radiation were observed as the helicity of optical pulses reversed. The observed phenomena are coincident with the characteristics of the helicity-dependent photocurrent on TIs. Our work demonstrates the potential applications of surface photocurrents on TIs for opto-spintronics devices.
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