Unraveling Photoinduced Spin Dynamics in the Topological Insulator Bi2Se3

被引：65

作者：

Wang, M. C. ^{[1
,2
]}

Qiao, S. ^{[3
,4
]}

Jiang, Z. ^{[5
]}

Luo, S. N. ^{[1
,2
]}

Qi, J. ^{[1
,2
]}

机构：

[1] Peac Inst Multiscale Sci, Chengdu 610031, Sichuan, Peoples R China

[2] Southwest Jiaotong Univ, Minist Educ, Key Lab Adv Technol Mat, Chengdu 610031, Sichuan, Peoples R China

[3] Chinese Acad Sci, Shanghai Inst Microsyst & Informat Technol, State Key Lab Funct Mat Informat, Shanghai 200050, Peoples R China

[4] ShanghaiTech Univ, Sch Phys Sci & Technol, Shanghai 200031, Peoples R China

[5] Georgia Inst Technol, Sch Phys, Atlanta, GA 30332 USA

来源：

PHYSICAL REVIEW LETTERS | 2016年 / 116卷 / 03期

基金：

中国国家自然科学基金;

关键词：

COHERENT THZ PHONONS; SURFACE; SPINTRONICS; SB;

D O I：

10.1103/PhysRevLett.116.036601

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report on a time-resolved ultrafast optical spectroscopy study of the topological insulator Bi2Se3. We unravel that a net spin polarization cannot only be generated using circularly polarized light via interband transitions between topological surface states (SSs), but also via transitions between SSs and bulk states. Our experiment demonstrates that tuning photon energy or temperature can essentially allow for photoexcitation of spin-polarized electrons to unoccupied topological SSs with two distinct spin relaxation times (similar to 25 and similar to 300 fs), depending on the coupling between SSs and bulk states. The intrinsic mechanism leading to such distinctive spin dynamics is the scattering in SSs and bulk states which is dominated by E-g(2) and A(1g)(1) phonon modes, respectively. These findings are suggestive of novel ways to manipulate the photoinduced coherent spins in topological insulators.

引用

页数：6

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