Can I read Tunable Giant Spin Hall Conductivities in a Strong Spin-Orbit Semimetal: Bi$ {1-x}$Sb$ x$ on EtoBox?

Tunable Giant Spin Hall Conductivities in a Strong Spin-Orbit Semimetal: Bi$ {1-x}$Sb$ x$ by Şahin, Cüneyt; Flatté, Michael E. is a scholarly article available to read on EtoBox.

What is Tunable Giant Spin Hall Conductivities in a Strong Spin-Orbit Semimetal: Bi$ {1-x}$Sb$ x$ about?

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 ($\hbar$/e)($\Omega$cm)$^{-1}$ for bismuth to 96 ($\hbar$/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.

Author

Şahin, Cüneyt; Flatté, Michael E.

Published

2014

Language

EN