Spin Hall Effects Due to Phonon Skew Scattering

Area of Science:

• Condensed Matter Physics
• Spintronics
• Materials Science

Background:

• Spin Hall effects in metals often depend on Mott skew scattering.
• High-temperature spin Hall effects are experimentally relevant.
• Phonon skew scattering is a key high-temperature mechanism.

Purpose of the Study:

• Investigate phonon skew scattering in metallic systems.
• Analyze the temperature dependence of phonon skew scattering spin Hall conductivity.
• Determine conditions for observing extrinsic spin-orbit scattering dominance at high temperatures.

Main Methods:

• Theoretical investigation of phonon skew scattering.
• Analysis of spin Hall conductivity and spin Hall angle.
• Consideration of temperature effects relative to the Debye temperature (T_{D}).

Main Results:

• Phonon skew scattering spin Hall conductivity is nearly temperature-independent above T_{D}.
• In Rashba-like systems, a high-temperature linear spin Hall angle indicates extrinsic spin-orbit scattering dominance.
• This dominance is observed when intrinsic spin splitting is less than temperature.

Conclusions:

• Phonon skew scattering is a robust high-temperature spin Hall effect.
• Temperature independence above T_{D} simplifies experimental analysis.
• The findings provide criteria for identifying dominant scattering mechanisms in spintronic devices.