Orbital relaxation length from first-principles scattering calculations
arxiv(2024)
摘要
The orbital Hall effect generates a current of orbital angular momentum
perpendicular to a charge current. Experiments suggest that this orbital
current decays on a long length scale that is of the order of the spin flip
diffusion length or longer. We examine this suggestion using first-principles
quantum mechanical scattering calculations to study the decay of orbital
currents injected from an orbitally-polarized lead into thermally disordered
bulk systems of selected transition metals. We find that the decay occurs over
only a few atomic layers. On this length scale the orbital current may be
converted into a spin current if the spin Hall angle is sufficiently large, as
for Pt. In Cu, Cr and V with small spin Hall angles, the conversion into a spin
current is negligible in the bulk and significant conversion only occurs at
interfaces.
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