Theoretical models of Rashba spin splitting in asymmetric SrTiO3-based heterostructures

Abstract

Rashba spin splitting in two-dimensional (2D) semiconductor systems is generally calculated in a $\mathbf{k}\cdot \mathbf{p}$ Luttinger-Kohn approach where the spin splitting due to asymmetry emerges naturally from the bulk band structure. In recent years, several new classes of 2D systems have been discovered where electronic correlations are believed to have an important role. In these correlated systems, the effects of asymmetry leading to Rashba splitting have typically been treated phenomenologically. We compare these two approaches for the case of 2D electron systems in SrTiO${}_3$-based heterostructures, and find that the two models produce fundamentally different behavior in regions of the Brillouin zone that are particularly relevant for magnetotransport. Our results demonstrate the importance of identifying the correct approach in the quantitative interpretation of experimental data, and are likely to be relevant to a range of 2D systems in correlated materials.

arXiv commentPaper (4 figures) and supplementary material (2 figures)

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Cited by in corpus (9)

• Theory of the spin galvanic effect at oxide interfaces
• Correlation between Superconductivity, Band Filling and Electron Confinement at the LaAlO${}_3$-SrTiO${}_3$ Interface
• Tunable spin and orbital polarization in SrTiO3-based heterostructures
• Anisotropic Rashba splitting dominated by out-of-plane spin polarization in two-dimensional Janus $X{A}_{2}Y$ ($A$= Si, Sn, Ge; $X,Y$= Sb, Bi) with surface imperfection
• Spin to charge conversion at Rashba-split SrTiO${}_3$ interfaces from resonant tunneling
• Ballistic transport through quantum point contacts of multi-orbital oxides
• Current-induced spin polarization in isotropic k-cubed Rashba model: Theoretical study for p-doped semiconductor heterostructures and perovskite oxides interfaces
• Tunable correlation effects of magnetic impurities by the cubic Rashba spin-orbit couplings
• Rashba splitting in polar-nonpolar sandwich heterostructure : A DFT Study