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Theory of the Spin Galvanic Effect at Oxide Interfaces
Götz Seibold1, Sergio Caprara2, Marco Grilli2
1Institut für Theoretische Physik, BTU, Cottbus-Senftenberg, P.O. Box 101344, 03013 Cottbus, Germany.
The spin galvanic effect (SGE) converts spin polarization into electric current. This study analyzes SGE in oxide interfaces using a three-band model, crucial for understanding experimental data.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Spintronics
Background:
- The spin galvanic effect (SGE) is a phenomenon converting spin polarization into a transverse charge current.
- Recent experiments show significant SGE in the two-dimensional electron gas (2DEG) at LaAlO3/SrTiO3 oxide interfaces.
Purpose of the Study:
- To analyze the SGE in oxide interfaces using a multi-band model.
- To investigate the role of spin-orbit couplings and their contribution to spin-charge conversion.
- To understand the influence of disorder and temperature on SGE in these systems.
Main Methods:
- Theoretical analysis using a three-band model for Ti t2g orbitals.
- Numerical treatment to study the impact of disorder and temperature.
- Comparison with experimental data for oxide interfaces.
Main Results:
- The three-band model reveals diverse effective spin-orbit couplings contributing to spin-charge conversion.
- Disorder and temperature significantly influence the SGE, crucial for matching experimental observations.
- The model provides a framework for understanding SGE in complex oxide systems.
Conclusions:
- The study elucidates the microscopic mechanisms behind SGE in oxide interfaces.
- Effective spin-orbit couplings play a key role in spin-charge conversion efficiency.
- Incorporating disorder and temperature is essential for accurate theoretical descriptions of experimental SGE data.
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