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Rashba-like spin splitting along three momentum directions in trigonal layered PtBi2
Ya Feng1,2, Qi Jiang3, Baojie Feng4,5
1Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, 315201, Ningbo, China.
Nature Communications
|October 20, 2019
Summary
Researchers discovered a giant 3D Rashba-like spin splitting in trigonal PtBi2, offering new possibilities for spintronic devices. This finding enhances the manipulation of spin currents using electric fields.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Spintronics
Background:
- Spin-orbit coupling (SOC) is crucial for spintronic devices.
- Rashba-type SOC in systems lacking inversion symmetry enables electric field control of spin currents.
Purpose of the Study:
- To report the discovery of a giant anisotropic 3D Rashba-like spin splitting in trigonal layered PtBi2.
- To investigate the underlying mechanisms and potential applications in spintronics.
Main Methods:
- Theoretical investigation of electronic band structure.
- Analysis of spin polarization and momentum-space characteristics.
Main Results:
- Discovery of a giant anisotropic 3D Rashba-like spin splitting along three momentum directions in PtBi2.
- Identification of helical spin polarization around M points in the Brillouin zone.
- Quantification of the Rashba parameter (αR ≈ 4.36 eV Å) due to cooperative Rashba-type and Dresselhaus-type SOC.
Conclusions:
- The experimental realization of 3D Rashba-like spin splitting in PtBi2 holds fundamental scientific interest.
- This discovery opens avenues for exploring novel materials with unique functionalities for advanced spintronics.
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