Ballistic thermal transport in quantum wire modulated with two coupling quantum dots

Abstract

Ballistic thermal transport properties at low temperatures in a quantum wire modulated with two coupling quantum dots are studied. The results show that when the temperature is low enough, the reduced thermal conductance displays monotonic behavior with the change of structural parameters; while at higher temperature, the reduced thermal conductance displays a nonlinear behavior. It is found that the phonon transmission and thermal conductance sensitively depend on the relative position of quantum dots and symmetric axis of the quantum wire. When the symmetry axis of quantum wire is away from the center of the quantum dots, the thermal conductance increases monotonously. It is also found that the thermal conductance can be modulated by the magnitude of the quantum dots and the length between the two quantum dots. Moreover, inhomogeneous quantum transport steps and quantized thermal conductance plateau can be observed in such structure.