Tunable Giant Spin Hall Conductivities in a Strong Spin-Orbit Semimetal: Bi${}_{1-x}$Sb${}_x$

Abstract

Intrinsic spin Hall conductivities are calculated for strong spin-orbit Bi${}_{1-x}$Sb${}_x$ semimetals, from the Kubo formula and using Berry curvatures evaluated throughout the Brillouin zone from a tight-binding Hamiltonian. Nearly-crossing bands with strong spin-orbit interaction generate giant spin Hall conductivities in these materials, ranging from 474 ($\hslash$/e)($\Omega$cm)${}^{-1}$ for bismuth to 96 ($\hslash$/e)($\Omega$cm)${}^{-1}$ for antimony; the value for bismuth is more than twice that of platinum. The large spin Hall conductivities persist for alloy compositions corresponding to a three-dimensional topological insulator state, such as Bi${}_{0.83}$Sb${}_{0.17}$. The spin Hall conductivity could be changed by a factor of five for doped Bi, or for Bi${}_{0.83}$Sb${}_{0.17}$, by changing the chemical potential by 0.5 eV, suggesting the potential for doping or voltage tuned spin Hall current.

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• Topological nature of the proper spin current and the spin-Hall torque
• Spin-Hall effect due to the bulk states of topological insulators: Extrinsic contribution to the conserved spin current
• Geometric Origin of Intrinsic Spin Hall Effect in an Inhomogeneous Electric Field
• Intrinsic orbital and spin Hall effect in bismuth semimetal
• Anisotropic spin Hall and spin Nernst effects in bismuth semimetal
• Disorder- and Topology-Enhanced Fully Spin-Polarized Currents in Nodal Chain Spin-Gapless Semimetals
• Theory of spin and orbital charge conversion at the surface states of Bi_{1-x}Sb_x topological insulator
• Giant inverse Faraday effect in Dirac semimetals
• Spin Hall conductivity in Bi${}_{1-x}$Sb${}_x$ as an experimental test of bulk-boundary correspondence
• Preparation and Characterization of High Quality Bi1-xSbx Thin Films: A Sputtering Deposition Approach
• Bulk spin conductivity of three-dimensional topological insulator
• Current induced magneto-optical Kerr effect as a probe of Dirac carriers in Bi${}_{1-x}$Sb${}_x$ alloy
• Charge-to-spin conversion in epitaxial and polycrystalline Bi and Bi/Ag layers
• Identifying the Dirac point composition in Bi1-xSbx alloys using the temperature dependence of quantum oscillations