Figure 3
From: Lattice thermal transport in two-dimensional alloys and fractal heterostructures
(a) Graph showing variation of thermal conductivity in the self-similar \({\mathrm {MoSe_2}}/{\mathrm {WSe_2}}\) heterostructure as a function total W content. (b) Shows the per-atom heat flux vectors through the second-order fractal structure, with the arrows colored by the magnitude of the heat flux in the x-direction. It is apparent that the majority of the heat flux moves through the \({\mathrm {MoSe_2}}\) lattice and the \({\mathrm {MoSe_2}}/{\mathrm {WSe_2}}\) interface acts as the source of phonon scattering. (c) Angular distribution of local heat flux vectors in the pure (black) and heterostructured (red) \({\mathrm {MoSe_2}}\) crystals. (d) Plot of thermal conductivity of periodic \({\mathrm {MoSe_2}}/{\mathrm {WSe_2}}\) heterostructure as a function of their interfacial density is consistent with the thermal conductivity of the fractal \({\mathrm {MoSe_2}}|{\mathrm {WSe_2}}\) heterostructure, showing that incoherent phonons are the dominant thermal energy carriers in these materials.
