The impact of internal polarized monochromatic acoustic phonon emission on heat dissipation at nanoscale

Internal monochromatic acoustic phonon emission has a distinct impact on temperature distribution, as well as transient heat dissipation, depending on the emitted phonon frequency and its polarization branch. A Monte Carlo simulation of phonon transport was used to study the impact of internal acoustic phonon emission on heat dissipation at nanoscale in a silicon thin film. The cause of the emission can be due to other energy carriers or by a direct external source. The simulation utilized parabolic phonon dispersion relations in longitudinal acoustic (LA) and transverse acoustic (TA) polarizations with three phonon–phonon scatterings. The Normal and Umklapp phonon scatterings were included in the simulation. All the scattering events scatter phonons isotropically. Results indicated that monochromatic TA-phonon emission within the film tends to create higher local peak temperature than that of LA-phonon emission with an identical volumetric power generation.