Ballistic Thermal Transistor of Dielectric Four-terminal Nanostructures

TL;DR

This paper presents a theoretical model for a nano-thermal transistor using dielectric four-terminal nanostructures that manipulate ballistic phonon transport to control heat flow with potential applications in thermal management.

Contribution

It introduces a novel theoretical model for a thermal transistor based on mesoscopic ballistic phonon transport in dielectric four-terminal nanostructures.

Findings

Thermal flow exhibits saturation, asymmetry, and rectification at low temperatures.

Nonlinear temperature dependence of phonon modes explains the observed phenomena.

The results indicate feasibility for fabricating nano-thermal transistors.

Abstract

We report a theoretical model for a thermal transistor in dielectric four-terminal nanostructures based on mesoscopic ballistic phonon transport, in which a steady thermal flow condition of system is obtained to set up the temperature field effect of gate. In the environment, thermal flow shows the transisting behaviors at low temperatures: saturation, asymmetry, and rectification. The phenomena can be explained reasonably by the nonlinear variation of the temperature dependence of propagating phonon modes in terminals. The results suggest the possibility of the novel nano-thermal transistor fabrication.