Theory of Large Intrinsic Spin Hall Effect in Iridate Semimetals

Abstract

We theoretically investigate the mechanism to generate large intrinsic spin Hall effect in iridates or more broadly in 5d transition metal oxides with strong spin-orbit coupling. We demonstrate such a possibility by taking the example of orthorhombic perovskite iridate with nonsymmorphic lattice symmetry, SrIrO${}_3$, which is a three-dimensional semimetal with nodal line spectrum. It is shown that large intrinsic spin Hall effect arises in this system via the spin-Berry curvature originating from the nearly degenerate electronic spectra surrounding the nodal line. This effect exists even when the nodal line is gently gapped out, due to the persistent nearly degenerate electronic structure, suggesting a distinct robustness. The magnitude of the spin Hall conductivity is shown to be comparable to the best known example such as doped topological insulators and the biggest in any transition metal oxides. To gain further insight, we compute the intrinsic spin Hall conductivity in both of the bulk and thin film systems. We find that the geometric confinement in thin films leads to significant modifications of the electronic states, leading to even bigger spin Hall conductivity in certain cases. We compare our findings with the recent experimental report on the discovery of large spin Hall effect in SrIrO${}_3$ thin films.

14 pages, 19 figures, 4 tables

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• Dissipationless Quantum Spin Current at Room Temperature
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• Giant Orbital Hall Effect in Transition Metals: Origin of Large Spin and Anomalous Hall Effects
• Giant intrinsic spin Hall effect in the TaAs family of Weyl semimetals
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Cited by in corpus (20)

• Roadmap of spin-orbit torques
• Oxide spin-orbitronics: spin-charge interconversion and topological spin textures
• Anisotropic spin-orbit torque generation in epitaxial SrIrO3 by symmetry design
• Optical Signatures of Dirac Nodal-lines in NbAs${}_2$
• Exceptionally high, strongly temperature dependent, spin Hall conductivity of SrRuO3
• Role of Dirac nodal lines and strain on the high spin Hall conductivity of epitaxial IrO2 thin films
• Giant spin Hall Effect in two-dimensional monochalcogenides
• Tunable and Enhanced Rashba Spin-Orbit Coupling in Iridate-Manganite Heterostructures
• Materials challenges for SrRuO3: from conventional to quantum electronics
• Observation of Nonlinear Spin-Charge Conversion in the Thin Film of Nominally Centrosymmetric Dirac Semimetal SrIrO3 at Room Temperature
• Anisotropic linear and nonlinear charge-spin conversion in topological semimetal SrIrO3
• Geometric Origin of Intrinsic Spin Hall Effect in an Inhomogeneous Electric Field
• Single-layer spin-orbit-torque magnetization switching due to spin Berry curvature generated by minute spontaneous atomic displacement in a Weyl oxide
• Room temperature spin-orbit torque efficiency and magnetization switching in SrRuO3-based heterostructures
• Spin-orbit torque generation in bilayers composed of CoFeB and epitaxial SrIrO${}_3$ grown on an orthorhombic DyScO${}_3$ substrate
• Spin-orbit-stable type-II nodal line band crossing in n-doped monolayer MoX2 (X=S,Se,Te)
• Study of Nontrivial Magnetism in 3$d$-5$d$ Transition Metal based Double Perovskites
• Large asymmetric anomalous Nernst effect in the antiferromagnet SrIr${}_{0.8}$Sn${}_{0.2}$O${}_3$
• Giant non-volatile electric field control of proximity induced magnetism in the spin-orbit semimetal SrIrO3
• Coexistence of insulator-like paramagnon and metallic spin-orbit exciton modes in SrIrO${}_3$