Staggered spin Hall conductivity

Abstract

The intrinsic spin Hall effect plays an important role in spintronics applications, such as spin-orbit torque-based memory. The bulk space group symmetry determines the form of the bulk spin current conductivity tensor. This paper considers materials for which the local point group symmetry of individual atoms is lower than the global (bulk) symmetry. This enables a position-dependent spin current response, with additional tensor components allowed relative to the bulk response. We present a general method to compute the position-dependent intrinsic spin Hall conductivity, with similar computational effort relative to computing the bulk spin Hall conductivity. We also present the general symmetry-constrained form of the position-dependent spin current response. We apply this method to 1T'-WTe${}_2$, which exhibits a conventional spin Hall conductivity tensor component ${\sigma }_{xz}^y$ and a staggered unconventional component ${\sigma }_{xz}^z$. The magnitude of these two components, around 100 and 20 $(\mathrm{\Omega }\cdot \mathrm{cm}{)}^{-1}$, respectively, are comparable to the spin-orbit torque exerted on adjacent ferromagnets in experiments. We then consider orthorhombic PbTe, in which both uniform and staggered spin current conductivity are one order of magnitude larger.

Main text: 7 pages, 7 figures. Comments are welcome

References in corpus (28)

• Advanced capabilities for materials modelling with Quantum ESPRESSO
• Spin torque switching with the giant spin Hall effect of tantalum
• Spin Hall effect
• Type-II Weyl Semimetals
• Universal Intrinsic Spin-Hall Effect
• Magnetic switching by spin torque from the spin Hall effect
• Spin Torque Ferromagnetic Resonance Induced by the Spin Hall Effect
• Current-induced spin-orbit torques in ferromagnetic and antiferromagnetic systems
• Electrical switching of an antiferromagnet
• Switching of perpendicular magnetization by spin-orbit torques in the absence of external magnetic fields
• Control of spin-orbit torques through crystal symmetry in WTe2/ferromagnet bilayers
• Study of Intrinsic Spin Hall Effect and Orbital Hall Effect in 4d- and 5d- Transition Metals
• Hidden spin polarization in inversion-symmetric bulk crystals
• Intrinsic spin Hall effect in platinum metal
• Symmetry-imposed shape of linear response tensors
• Theory of Current-Induced Angular Momentum Transfer Dynamics in Spin-Orbit Coupled Systems
• Thickness dependence of spin-orbit torques generated by WTe2
• Unconventional charge-spin conversion in Weyl-semimetal WTe2
• Large multi-directional spin-to-charge conversion in low symmetry semimetal MoTe${}_2$ at room temperature
• Observation of Spin Hall Effect in Weyl Semimetal WTe2 at Room Temperature
• Layer-dependent spin-orbit torques generated by the centrosymmetric transition metal dichalcogenide $\beta$-MoTe${}_2$
• Current-induced torques in the presence of spin-orbit coupling
• Intrinsic Spin Hall Conductivity of MoTe2 and WTe2 Semimetals
• Automated construction of symmetrized Wannier-like tight-binding models from ab initio calculations
• Unconventional spin-orbit torque in transition metal dichalcogenide/ferromagnet bilayers from first-principles calculations
• Current-Induced Torques with Dresselhaus Symmetry Due to Resistance Anisotropy in 2D Materials
• Computation of intrinsic spin Hall conductivities from first principles using maximally-localized Wannier functions
• Local spin Hall conductivity

Cited by in corpus (4)

• Resolving spin currents and spin densities generated by charge-spin interconversion in systems with reduced crystal symmetry
• Efficient generation of out-of-plane polarized spin current in polycrystalline heavy metal devices with broken electric symmetries
• Generating unconventional spin-orbit torques with patterned phase gradients in tungsten thin films
• Tunable spin-charge conversion in class-I topological Dirac semimetals