Fig. 2. Typical temperature profile for LAPE samples with different average length (L0) and constant standard deviation (σ = 1 nm). The results are averaged over two mirror symmetry regions. The square and circle represent the temperature profile for L0 = 15 nm and L0 = 30 nm, respectively. In the presence of non-uniform temperature gradient for L0 = 30 nm, κ1 and κ2 denote the local thermal conductivity in the boundary and internal region, respectively. The inset depicts the calculation of effective thermal conductivity κ0 for L0 = 30 nm based on the artificial uniform temperature gradient between two ends.
