Tunable spin and orbital polarization in SrTiO3-based heterostructures

Abstract

We formulate the effective Hamiltonian of Rashba spin-orbit coupling (RSOC) in $\mathrm{LaAl}{\mathrm{O}}_3/SrTi{\mathrm{O}}_3$ (LAO/STO) heterostructures. We derive analytical expressions of properties, e.g., Rashba parameter, effective mass, band edge energy and orbital occupancy, as functions of material and tunable heterostructure parameters. While linear RSOC is dominant around the $\Gamma$-point, cubic RSOC becomes significant at the higher-energy anti-crossing region. We find that linear RSOC stems from the structural inversion asymmetry (SIA), while the cubic term is induced by both SIA and bulk asymmetry. Furthermore, the SOC strength shows a striking dependence on the tunable heterostructure parameters such as STO thickness and the interfacial electric field which is ascribed to the quantum confinement effect near the LAO/STO interface. The calculated values of the linear and cubic RSOC are in agreement with previous experimental results.

References in corpus (28)

• Magnetic effects at the interface between nonmagnetic oxides
• Tunable Rashba spin-orbit interaction at oxide interfaces
• Coexistence of Magnetic Order and Two-dimensional Superconductivity at LaAlO${}_3$/SrTiO${}_3$ Interfaces
• Origin of charge density at LaAlO3-on-SrTiO3 hetero-interfaces; possibility of intrinsic doping
• Highly efficient and tuneable spin-to-charge conversion through Rashba coupling at oxide interfaces
• Coexistence of superconductivity and ferromagnetism in two dimensions
• Tuning spin-orbit coupling and superconductivity at the SrTiO3/LaAlO3 interface: a magneto-transport study
• Theory of spin-orbit coupling at LaAlO3/SrTiO3 interfaces and SrTiO3 surfaces
• Physics of SrTiO${}_3$-based heterostructures and nanostructures: a review
• Critical thickness for ferromagnetism in LaAlO3/SrTiO3 heterostructures
• Observation of Inverse Edelstein Effect in Rashba-Split 2DEG between SrTiO3 and LaAlO3 at Room Temperature
• Theory of t2g electron-gas Rashba interactions
• Theory of the SrTiO3 Surface State Two-Dimensional Electron Gas
• First-principles modeling of electrostatically doped perovskite systems
• Room Temperature Giant Charge-to-Spin Conversion at SrTiO3/LaAlO3 Oxide Interface
• Anisotropic two-dimensional electron gas at SrTiO3(110) protected by its native overlayer
• Unexpected Anisotropic Two Dimensional Electron Gas at the LaAlO3/SrTiO3 (110) Interface
• Rashba induced magnetoconductance oscillations in the LaAlO3-SrTiO3 heterostructure
• Origin and Transport Signatures of Spin-Orbit Interactions in One- and Two-Dimensional SrTiO${}_3$-Based Heterostructures
• Current-driven spin orbit field in LaAlO3/SrTiO3 heterostructures
• Spin responses and effective Hamiltonian for the two dimensional electron gas at oxide interface {LaAlO}${}_3$/{SrTiO}${}_3$
• Review of Spin Orbit Coupled Semimetal SrIrO3 in thin film form
• d0 Perovskite-Semiconductor Electronic Structure
• Accumulation, inversion, and depletion layers in SrTiO${}_3$
• Sensitively Temperature-Dependent Spin Orbit Coupling in SrIrO3 Thin Films
• k.p subband structure of the LaAlO3/SrTiO3 interface
• Theoretical models of Rashba spin splitting in asymmetric SrTiO3-based heterostructures
• Possible Flexoelectric Origin of the Lifshitz Transition in LaAlO${}_3$/SrTiO${}_3$ Interfaces

Cited by in corpus (7)

• Tunable Rashba spin-orbit coupling and its interplay with multiorbital effect and magnetic ordering at oxide interfaces
• Spin to charge conversion at Rashba-split SrTiO${}_3$ interfaces from resonant tunneling
• Engineered Kondo screening and nonzero Berry phase in SrTiO3/LaTiO3/SrTiO3 heterostructures
• Enhanced torque efficiency in ferromagnetic multilayers by introducing naturally oxidized Cu
• Tunable correlation effects of magnetic impurities by the cubic Rashba spin-orbit couplings
• Semiclassical spin transport in LaO/STO system in the presence of multiple Rashba spin orbit couplings
• Higher Chern Number States in Curved Periodic Nanowires