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Electrically Switchable and Tunable Rashba-Type Spin Splitting in Covalent Perovskite Oxides
Julien Varignon1, Jacobo Santamaria1,2, Manuel Bibes1
1Unité Mixte de Physique, CNRS, Thales, Université Paris Sud, Université Paris-Saclay, 91767, Palaiseau, France.
Physical Review Letters
|April 6, 2019
Summary
Researchers discovered a bismuth-based perovskite with a tunable Rashba spin-orbit coupling. This property can be controlled by electric fields and structural changes, enabling efficient spin-charge conversion in complex oxides.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Solid-State Chemistry
Background:
- Transition-metal perovskites (ABO3) exhibit tunable physical properties influenced by structural parameters like BO6 octahedra rotations.
- Oxides with large electric dipoles and heavy elements are promising for Rashba spin-orbit coupling, enabling efficient charge-spin interconversion.
- The Rashba interaction and its link to structural distortions in perovskites remain underexplored, with limited studies in SrTiO3-based interfaces.
Purpose of the Study:
- To identify and characterize a bismuth-based perovskite exhibiting a significant and electrically switchable Rashba interaction.
- To investigate the control of Rashba interaction amplitude via ferroelectric polarization and oxygen octahedra breathing modes.
- To explore the role of Bi-O bond covalence in modulating spin-orbit coupling and emergent properties.
Main Methods:
- Identification of a novel bismuth-based perovskite material.
- Experimental and/or theoretical investigation of Rashba spin-orbit coupling.
- Analysis of the influence of ferroelectric polarization on the Rashba interaction.
- Characterization of the effect of oxygen octahedra breathing modes on spin-orbit coupling.
- Evaluation of the role of Bi-O bond covalence.
Main Results:
- A bismuth-based perovskite with a large, electrically switchable Rashba interaction was identified.
- The amplitude of the Rashba interaction is controllable by ferroelectric polarization.
- The breathing mode of oxygen octahedra also modulates the Rashba interaction amplitude.
- Strong covalence of Bi-O bonds is crucial for this tunable Rashba effect.
Conclusions:
- Novel strategies for creating agile spin-charge converters based on perovskite oxides have been developed.
- The study highlights the significance of covalence in designing and tuning emergent properties in complex oxides.
- This work opens new avenues for spintronic applications utilizing perovskite materials.
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