Switchable and tunable Rashba-type spin splitting in covalent perovskite oxides

Abstract

In transition metal perovskites (ABO3) most physical properties are tunable by structural parameters such as the rotation of the BO6 octahedra. Examples include the Néel temperature of orthoferrites, the conductivity of mixed-valence manganites, or the band gap of rare-earth scandates. Since oxides often host large internal electric dipoles and can accommodate heavy elements, they also emerge as prime candidates to display Rashba spin-orbit coupling, through which charge and spin currents may be efficiently interconverted. However, despite a few experimental reports in SrTiO3-based interface systems, the Rashba interaction has been little studied in these materials, and its interplay with structural distortions remain unknown. In this Letter, we identify a bismuth-based perovskite with a giant, electrically-switchable Rashba interaction whose amplitude can be controlled by both the ferroelectric polarization and the breathing mode of oxygen octahedra. This particular structural parameter arises from the strongly covalent nature of the Bi-O bonds, reminiscent of the situation in perovskite nickelates. Our results not only provide novel strategies to craft agile spin-charge converters but also highlight the relevance of covalence as a powerful handle to design emerging properties in complex oxides.

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Cited by in corpus (16)

• Oxide spin-orbitronics: spin-charge interconversion and topological spin textures
• Electrical control of magnetism by electric field and current-induced torques
• Rashba spin-splitting in ferroelectric oxides: from rationalizing to engineering
• Persistent spin helix in Rashba-Dresselhaus ferroelectric CsBiNb2O7
• Modulated Interlayer Exciton Properties in a Two-Dimensional Moire Crystal
• Bulk Rashba Effect in Multiferroics: a theoretical prediction for BiCoO3
• Tunable spin textures in polar antiferromagnetic hybrid organic inorganic perovskites by electric and magnetic fields
• Spin-Neutral Tunneling Anomalous Hall Effect
• Origin of Rashba spin-splitting and strain tunability in ferroelectric bulk CsPbF${}_3$
• Switchable enhanced spin photocurrent in Rashba and cubic Dresselhaus ferroelectric semiconductors
• Spin and orbital Edelstein effect in a bilayer system with Rashba interaction
• A Novel Ferroelectric Rashba Semiconductor
• Spin Texture as Polarization Fingerprint of Halide Perovskites
• Controlling spin without magnetic fields -- the Bloch-Rashba rotator
• Externally controlled and switchable 2D electron gas at the Rashba interface between ferroelectrics and heavy $d$ metals
• Electrically switchable non-relativistic Zeeman spin splittings in collinear antiferromagnets