Tunable spin texture in ferroelectric B i 6 O 9

2025/11/10 by Li-Qi Huang, Ming Li, Hang Zhou +5 · 1 voice
Materials Science · Physics and Astronomy · #Multiferroics and related materials #2D Materials and Applications #Topological Materials and Phenomena

paper · doi:10.1103/l2t3-n7r1

openalex created_date 2025/11/10 · openalex publication_date 2025/11/10 · openalex updated_date 2026/08/01

Abstract

Momentum-dependent spin polarization exists in ferroelectric materials with strong spin-orbit coupling (SOC), which can be controlled by ferroelectric switching, promising for nonvolatile applications in spintronics. In the present work, we investigate the SOC-induced spin texture in orthorhombic Bi₆O₉, a recently discovered ferroelectric material with robust polarization down to the atomic limit. Utilizing first-principles calculations, we reveal the SOC-induced giant band splitting around the \ensuremathΓ point and notable spin texture, which can be well described by a k\ifmmode⋅\else\textperiodcentered\fip Hamiltonian with sizable Rashba parameters of \ensuremathλ_R=0.65\phantom\rule0.28em0exeV\phantom\rule0.16em0ex\AA and Dresselhaus parameters \ensuremathλ_D=\ensuremath-0.23\phantom\rule0.28em0exeV\phantom\rule0.16em0ex\AA at the conduction-band minimum. We also find that the SOC parameters can be effectively modulated by strain, resulting from band splitting and band anticrossing collectively, supported by substrate and strain-dependent calculations. The highly tunable spin texture indicates the opportunities for using Bi₆O₉ for the nonvolatile charge-spin conversion useful in spintronics.

Citations

• Projector augmented-wave method
• From ultrasoft pseudopotentials to the projector augmented-wave method
• Spin polarization of conduction electrons induced by electric current in two-dimensional asymmetric electron systems
• Spin-Orbit Coupling Effects in Zinc Blende Structures
• Efficient iterative schemes forab initiototal-energy calculations using a plane-wave basis set
• VASPKIT: A user-friendly interface facilitating high-throughput computing and analysis using VASP code
• Theory of spin and orbital Edelstein effects

Discussions

• Led by Ding-Fu Shao, we found that the ferroelectric material B⁢i6⁢O9 I preivsouly desgined from theory (10.1126/science.abm5134) also shows potential spintronic applications due to highly tunable spi [bsky, 0 points, 0 comments]