Author(s): Zheng, MY (Zheng, Maoyuan); Yin, ZG (Yin, Zhigang); Cheng, Y (Cheng, Yong); Wu, JL (Wu, Jinliang); Zhang, XW (Zhang, Xingwang); Qi, J (Qi, Jing)

Source: JAPANESE JOURNAL OF APPLIED PHYSICS Volume: 60 Issue: 5 Article Number: 050906 DOI: 10.35848/1347-4065/abf949 Published: MAY 1 2021

Abstract: We report the existence of bulk persistent spin texture in P4mm tetragonal BiFeO3, a ferroelectric with ultrahigh spontaneous polarization. Our density functional theory calculations reveal that tetragonal BiFeO3 exhibits sufficiently strong spin-orbit coupling, yielding a sizable Rashba coefficient of 0.31 eV center dot angstrom. More importantly, it is demonstrated that the polarization-induced spin-orbit field is unidirectional on the Z-Gamma-X plane which contains the polar axis. Consequently, there emerges a momentum-independent spin texture, allowing a long-lived persistent spin helix with a wavelength of 23 nm in the real space.

Accession Number: WOS:000648117700001

ISSN: 0021-4922

eISSN: 1347-4065

Full Text: https://iopscience.iop.org/article/10.35848/1347-4065/abf949