Spin texture driven spintronic enhancement at the LaAlO${}_3$/SrTiO${}_3$ interface

Abstract

Recent experiments have shown that transition metal oxide heterostructures such as SrTiO${}_3$-based interfaces, exhibit large, gate tunable, spintronic responses. Our theoretical study showcases key factors controlling the magnitude of the conversion, measured by the inverse Edelstein and Spin Hall effects, and their evolution with respect to an electrostatic doping. The origin of the response can be linked to spin-orbital textures. These stem from the broken inversion symmetry at the interface which produces an unusual form of the interfacial spin-orbit coupling, provided a bulk atomic spin-orbit contribution is present. The amplitudes and variations of these observables are direct consequences of the multi-orbital subband structure of these materials, featuring avoided and topological crossings. Interband contributions to the coefficients lead to enhanced responses and non-monotonic evolution with doping. We highlight these effects using analytical approaches and low energy modeling.

arXiv comment5 pages, 2 figures

References in corpus (22)

• Quantum Spin Hall Effect and Topological Phase Transition in HgTe Quantum Wells
• Quantum Spin Hall Insulator State in HgTe Quantum Wells
• Universal Intrinsic Spin-Hall Effect
• Spin transfer torque devices utilizing the giant spin Hall effect of tungsten
• Room Temperature Reversible Spin Hall Effect
• Emergent Phenomena Induced by Spin-Orbit Coupling at Surfaces and Interfaces
• Tunable Rashba spin-orbit interaction at oxide interfaces
• Comparative Measurements of Inverse Spin Hall and Magnetoresistance in YIG|Pt and YIG|Ta
• Highly efficient and tuneable spin-to-charge conversion through Rashba coupling at oxide interfaces
• Theory of spin-orbit coupling at LaAlO3/SrTiO3 interfaces and SrTiO3 surfaces
• Inverse Edelstein Effect
• Enhancement of the Spin Accumulation at the Interface Between a Spin-Polarized Tunnel Junction and a Semiconductor
• Spin precession and inverted Hanle effect in a semiconductor near a finite-roughness ferromagnetic interface
• Quasiparticle dynamics and spin-orbital texture of the SrTiO3 two-dimensional electron gas
• Theory of t2g electron-gas Rashba interactions
• Nanoscale Phenomena in Oxide Heterostructures
• Theory of the SrTiO3 Surface State Two-Dimensional Electron Gas
• Intraband and interband spin-orbit torques in non-centrosymmetric ferromagnets
• Computation of intrinsic spin Hall conductivities from first principles using maximally-localized Wannier functions
• Topological states at the (001) surface of SrTiO3
• Nature of Orbital and Spin Rashba Coupling in the Surface Bands of SrTiO3 and KTaO3
• Strain Engineering of the Intrinsic Spin Hall Conductivity in a SrTiO${}_3$ Quantum Well

Cited by in corpus (5)

• Theory of inverse Rashba-Edelstein effect induced by spin pumping into a two-dimensional electron gas
• Theory of the inverse Rashba-Edelstein effect induced by thermal spin injection
• Semiclassical spin transport in LaO/STO system in the presence of multiple Rashba spin orbit couplings
• Theoretical analysis of the inverse Edelstein effect at the LaAlO${}_3$ / SrTiO${}_3$ interface with an effective tight-binding model: Important role of the second $d_{xy}$ subband
• Spin Pumping into two-dimensional systems