Ballistic thermal transport contributed by the in-plane waves in a quantum wire modulated with an acoustic nanocavity

Abstract

We investigate ballistic thermal transport contributed by the in-plane waves in a quantum wire modulated with an acoustic nanocavity. Here, the numerical calculations for two transmitted components (P wave and SV wave) are made to consider the mode conversion. Results show for the P wave component that the universal quantum thermal conductance can be observed in spite of structural details in the low temperature limit, and then the thermal conductance decreases with increasing temperature. However, for the SV wave component, the thermal conductance increases from zero monotonically with temperature. These indicate the mode conversion is directly proportional to the temperature. In addition, it is found that the mode conversion sensitively depend upon the incident frequency, the index of the modes as well as structural parameters. A brief analysis of these results is given.