Helicity-Dependent Terahertz Radiation from Topological Insulator Sb2Te3 Thin Film by Femtosecond Optical Excitation

被引：0

作者：

Tu, Chien-Ming ^{[1
,2
,3
]}

Chen, Yi-Cheng ^{[1
]}

Huang, Ping ^{[1
]}

Chuang, Pei-Yu ^{[4
]}

Lin, Ming-Yu ^{[4
]}

Luo, Chih-Wei ^{[1
]}

Cheng, Cheng-Maw ^{[5
]}

Lin, Jiunn-Yuan ^{[6
]}

Huang, Jung-Chun ^{[4
]}

Pong, Way-Faung ^{[2
]}

Kobayashi, Takayoshi ^{[1
,7
]}

机构：

[1] Natl Chiao Tung Univ, Dept Electrophys, Hsinchu 30011, Taiwan

[2] Tamkang Univ, Dept Phys, New Taipei 25137, Taiwan

[3] Lund Univ, Dept Phys, POB 118, SE-22100 Lund, Sweden

[4] Natl Cheng Kung Univ, Dept Phys, Tainan 701, Taiwan

[5] Natl Synchrotron Radiat Res Ctr, Hsinchu 30076, Taiwan

[6] Natl Chiao Tung Univ, Inst Phys, Hsinchu 30011, Taiwan

[7] Univ Electrocommun, Adv Ultrafast Laser Res Ctr, Tokyo 1828585, Japan

来源：

2016 41ST INTERNATIONAL CONFERENCE ON INFRARED, MILLIMETER, AND TERAHERTZ WAVES (IRMMW-THZ) | 2016年

关键词：

PHOTOCURRENTS;

D O I：

暂无

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

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.

引用

页数：2

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