Cross-plane Heat Conduction in III-V Semiconductor Superlattices.

Thermal management is a crucial component in analyzing the performance of III-V semiconductor superlattice-based optoelectronic devices. Here we provide a rigorous physical analysis of cross-plane thermal conduction in GaAs/AlAs and their alloy-based superlattices while rigorously accounting for phonon interlayer coupling and interfacial structural characteristics. We present a comprehensive study of superlattice thermal transport, including structure-property relations, spectral and modal descriptions, and contrast it with in-plane heat conduction thereby explaining the resultant anisotropy in III-V semiconductor superlattices. Our results provide key physical insights into rational material design for thermal modulation in optoelectronic devices.