Helicity-dependent terahertz radiation from topological insulator Sb2Te3 thin film by femtosecond optical excitation

Chien Ming Tu, Yi Cheng Chen, Ping Huang, Pei Yu Chuang, Ming Yu Lin, Chih Wei Luo, Cheng Maw Cheng, Jiunn Yuan Lin, Jung Chun Huang, Way Faung Pong, Takayoshi Kobayashi

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

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.

Original languageEnglish
Title of host publication41st International Conference on Infrared, Millimeter and Terahertz Waves, IRMMW-THz 2016
PublisherIEEE Computer Society
ISBN (Electronic)9781467384858
DOIs
StatePublished - 28 Nov 2016
Event41st International Conference on Infrared, Millimeter and Terahertz Waves, IRMMW-THz 2016 - Copenhagen, Denmark
Duration: 25 Sep 201630 Sep 2016

Publication series

NameInternational Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz
Volume2016-November
ISSN (Print)2162-2027
ISSN (Electronic)2162-2035

Conference

Conference41st International Conference on Infrared, Millimeter and Terahertz Waves, IRMMW-THz 2016
CountryDenmark
CityCopenhagen
Period25/09/1630/09/16

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