作者: Jinliang Wu , Xingwang Zhang , Yong Cheng , Zhigang Yin , Jing Qi
DOI: 10.35848/1347-4065/ABF949
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摘要: We report the existence of bulk persistent spin texture in P4mm tetragonal BiFeO 3, a ferroelectric with ultrahigh spontaneous polarization. Our density functional theory calculations reveal that tetragonal BiFeO 3 exhibits sufficiently strong spin–orbit coupling, yielding a sizable Rashba coefficient of 0.31 eV· Å. More importantly, it is demonstrated that the polarization-induced spin–orbit field is unidirectional on the Z–Γ–X plane which contains the polar axis. Consequently, there emerges a momentum-independent spin texture …