Thermal conductivity transition regime of zigzag and armchair black phosphorus

The investigations of lattice thermal conductivity of few layer black phosphorus show the onset of anisotropic thermal conductivity cross-over between zigzag and armchair direction in the low temperature regime ((similar to)25K - 40K). For the first time, we address anisotropic-isotropic-low anisotropic transition regimes of thermal conductivity in black phosphorus and discuss the influence of phonon-boundary, phonon-phonon and phonon-impurity scattering on transition regimes. Single set of phonon scattering coefficients for black phosphorus obtained are used to describe the thermal conductivity cross-over of zigzag and armchair black phosphorus. We analyze the thermal conductivity cross-over data and found to show the best fit to the recent experimental thermal conductivity reports in the wide temperature range (10K-600K). The importance of the phonon frequency and angle of phonon incidence dependent speculation reflections is discussed.

Automated summary

The investigation of lattice thermal conductivity in few-layer black phosphorus reveals an anisotropic thermal conductivity cross-over between zigzag and armchair directions at low temperatures. The study addresses the transition regimes of anisotropic-isotropic-low anisotropic thermal conductivity in black phosphorus and discusses the influence of phonon-boundary, phonon-phonon, and phonon-impurity scattering. The obtained phonon scattering coefficients are used to describe the thermal conductivity cross-over of zigzag and armchair black phosphorus, showing a good fit to experimental reports in a wide temperature range.