Rashba-like spin splitting along three momentum directions in trigonal layered PtBi2

Ya Feng, Qi Jiang, Baojie Feng, Meng Yang, Tao Xu, Wenjing Liu, Xiufu Yang, Masashi Arita, Eike F. Schwier, Kenya Shimada, Harald O. Jeschke, Ronny Thomale, Youguo Shi, Xianxin Wu (), Shaozhu Xiao (), Shan Qiao and Shaolong He ()
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Ya Feng: Chinese Academy of Sciences
Qi Jiang: Chinese Academy of Sciences
Baojie Feng: Chinese Academy of Sciences
Meng Yang: Chinese Academy of Sciences
Tao Xu: Chinese Academy of Sciences
Wenjing Liu: Chinese Academy of Sciences
Xiufu Yang: Chinese Academy of Sciences
Masashi Arita: Hiroshima University
Eike F. Schwier: Hiroshima University
Kenya Shimada: Hiroshima University
Harald O. Jeschke: Okayama University
Ronny Thomale: Julius-Maximilians University of Wurzburg, Am Hubland
Youguo Shi: Chinese Academy of Sciences
Xianxin Wu: Julius-Maximilians University of Wurzburg, Am Hubland
Shaozhu Xiao: Chinese Academy of Sciences
Shan Qiao: Chinese Academy of Sciences
Shaolong He: Chinese Academy of Sciences

Nature Communications, 2019, vol. 10, issue 1, 1-8

Abstract: Abstract Spin-orbit coupling (SOC) has gained much attention for its rich physical phenomena and highly promising applications in spintronic devices. The Rashba-type SOC in systems with inversion symmetry breaking is particularly attractive for spintronics applications since it allows for flexible manipulation of spin current by external electric fields. Here, we report the discovery of a giant anisotropic Rashba-like spin splitting along three momentum directions (3D Rashba-like spin splitting) with a helical spin polarization around the M points in the Brillouin zone of trigonal layered PtBi2. Due to its inversion asymmetry and reduced symmetry at the M point, Rashba-type as well as Dresselhaus-type SOC cooperatively yield a 3D spin splitting with αR ≈ 4.36 eV Å in PtBi2. The experimental realization of 3D Rashba-like spin splitting not only has fundamental interests but also paves the way to the future exploration of a new class of material with unprecedented functionalities for spintronics applications.

Date: 2019
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DOI: 10.1038/s41467-019-12805-2

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