Orbital-selective spin texture and its manipulation in a topological insulator

Zhuojin Xie, Shaolong He, Chaoyu Chen, Ya Feng, Hemian Yi, Aiji Liang, Lin Zhao, Daixiang Mou, Junfeng He, Yingying Peng, Xu Liu, Yan Liu, Guodong Liu, Xiaoli Dong, Li Yu, Jun Zhang, Shenjin Zhang, Zhimin Wang, Fengfeng Zhang, Feng Yang, Qinjun Peng, Xiaoyang Wang, Chuangtian Chen, Zuyan Xu and X. J. Zhou ()
Additional contact information
Zhuojin Xie: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences
Shaolong He: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences
Chaoyu Chen: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences
Ya Feng: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences
Hemian Yi: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences
Aiji Liang: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences
Lin Zhao: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences
Daixiang Mou: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences
Junfeng He: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences
Yingying Peng: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences
Xu Liu: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences
Yan Liu: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences
Guodong Liu: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences
Xiaoli Dong: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences
Li Yu: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences
Jun Zhang: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences
Shenjin Zhang: Technical Institute of Physics and Chemistry, Chinese Academy of Sciences
Zhimin Wang: Technical Institute of Physics and Chemistry, Chinese Academy of Sciences
Fengfeng Zhang: Technical Institute of Physics and Chemistry, Chinese Academy of Sciences
Feng Yang: Technical Institute of Physics and Chemistry, Chinese Academy of Sciences
Qinjun Peng: Technical Institute of Physics and Chemistry, Chinese Academy of Sciences
Xiaoyang Wang: Technical Institute of Physics and Chemistry, Chinese Academy of Sciences
Chuangtian Chen: Technical Institute of Physics and Chemistry, Chinese Academy of Sciences
Zuyan Xu: Technical Institute of Physics and Chemistry, Chinese Academy of Sciences
X. J. Zhou: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences

Nature Communications, 2014, vol. 5, issue 1, 1-9

Abstract: Abstract Topological insulators represent a new quantum state of matter that are insulating in the bulk but metallic on the edge or surface. In the Dirac surface state, it is well-established that the electron spin is locked with the crystal momentum. Here we report a new phenomenon of the spin texture locking with the orbital texture in a topological insulator Bi2Se3. We observe light-polarization-dependent spin texture of both the upper and lower Dirac cones that constitutes strong evidence of the orbital-dependent spin texture in Bi2Se3. The different spin texture detected in variable polarization geometry is the manifestation of the spin-orbital texture in the initial state combined with the photoemission matrix element effects. Our observations provide a new orbital degree of freedom and a new way of light manipulation in controlling the spin structure of the topological insulators that are important for their future applications in spin-related technologies.

Date: 2014
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DOI: 10.1038/ncomms4382

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