Four-phonon scattering dominates optical phonon resistance in AlSb, cutting its room-temperature thermal conductivity by about half and reducing the isotope effect from 83% to 2%.
Dashed lines give the results with only three-phonon scattering, and solid lines give the results after including four-phonon scattering
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Four-phonon scattering diminishes the optical phonon contribution and isotope effect to thermal conductivity of III-V semiconductors
Four-phonon scattering dominates optical phonon resistance in AlSb, cutting its room-temperature thermal conductivity by about half and reducing the isotope effect from 83% to 2%.