Rashba spin-splitting in ferroelectric oxides: from rationalizing to engineering

Abstract

Ferroelectric Rashba semiconductors (FERSC), in which Rashba spin-splitting can be controlled and reversed by an electric field, have recently emerged as a new class of functional materials useful for spintronic applications. The development of concrete devices based on such materials is, however, still hampered by the lack of robust FERSC compounds. Here, we show that the coexistence of large spontaneous polarisation and sizeable spin-orbit coupling is not sufficient to have strong Rashba effects and clarify why simple ferroelectric oxide perovskites with transition metal at the B-site are typically not suitable FERSC candidates. By rationalizing how this limitation can be by-passed through band engineering of the electronic structure in layered perovskites, we identify the Bi${}_2$WO${}_6$ Aurivillius crystal as the first robust ferroelectric with large and reversible Rashba spin-splitting, that can even be substantially doped without losing its ferroelectric properties. Importantly, we highlight that a unidirectional spin-orbit field arises in layered Bi${}_2$WO${}_6$, resulting in a protection against spin-decoherence.We highlight moreover that a unidirectional spin-orbit field arises in Bi${}_2$WO${}_6$, in which the spin-texture is so protected against spin-decoherence.

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Cited by in corpus (24)

• Oxide spin-orbitronics: spin-charge interconversion and topological spin textures
• Ultrathin SnTe films as a route towards all-in-one spintronics devices
• Tunable spin textures in polar antiferromagnetic hybrid organic inorganic perovskites by electric and magnetic fields
• Switchable Rashba Anisotropy in Two-dimensional Hybrid Organic-Inorganic Perovskite by Hybrid Improper Ferroelectricity
• Theory of electric, magnetic, and toroidal polarizations in crystalline solids with applications to hexagonal lonsdaleite and cubic diamond
• Spin-Neutral Tunneling Anomalous Hall Effect
• Theory of superconductivity mediated by Rashba coupling in incipient ferroelectrics
• Theory of superconductivity in doped quantum paraelectrics
• Deterministic influence of substrate-induced oxygen vacancy diffusion on $B{i}_{2}W{O}_6$ thin film growth
• Generalized Rashba Electron-Phonon Coupling and Superconductivity in Strontium Titanate
• First-principles study of lattice dynamical properties of the room-temperature $P{2}_1/n$ and ground-state $P{2}_1/c$ phases of WO${}_3$
• Strain engineering a persistent spin helix with infinite spin lifetime
• Full-zone Persistent Spin Textures with Giant Spin Splitting in Two-dimensional Group IV-V Compounds
• Anisotropic Rashba coupling to polar modes in KTaO3
• Universal symmetry-protected persistent spin textures in nonmagnetic solids
• Duality and degeneracy lifting in two-dimensional electron liquids on SrTiO${}_3$(001)
• Accidental persistent spin textures in the proustite mineral family
• Strain-Induced Modulation of Spin Splitting and Persistent Spin Textures in Low-Symmetry 2D Hybrid Perovskites: A case study of RP phase
• Observation of charge-to-spin conversion with giant efficiency at Ni${}_{0.8}$Fe${}_{0.2}$/Bi${}_2$WO${}_6$ interface
• Revival of Layered Ferroelectrics in Thin Films
• Spin-dependent anisotropic electron-phonon coupling in KTaO${}_3$
• Orbital Hybridization Induces Giant Cubic Rashba Effect at Cu/WO${}_3$ Interface
• Large geometric polarization and magnetic behavior in the multiferroic quasi-2D SrNiF${}_4$ fluoride
• Engineering of Ferroic Orders in Thin Films by Anionic Substitution