(color online) (a) Temperature profile of DNT-55 (length of ∼ 24 nm), which possesses only a single SW transformation defect at the middle of the structure. Top panel schematically shows the studied sample. (b) Comparisons of the mode lifetimes between (3, 0) CNT and DNT-8. The mode lifetime is calculated using the package Jazz^[130,131] based on the corresponding vibrational density of states (VDOS). Adapted from Ref. [57], with permission from Elsevier.