2025/06/03 by Takahiro Yamamoto, Sumiyoshi, Aina, Yamamoto, Takahiro
Materials Science · Physics and Astronomy · #Carbon Nanotubes in Composites #Force Microscopy Techniques and Applications #Thermal properties of materials
paper · pdf · doi:10.48550/arxiv.2506.02569
We theoretically elucidate the system length (L) dependence of phonon-induced current noise in carbon nanotubes at room temperature over a broad range, encompassing the quantum ballistic and classical diffusive regimes. The power spectral density for the current noise is maximally enhanced when L is comparable to the mean free path L0 of an electron. In the ballistic limit of L/L0≪ 1, the power spectral density increases in proportion to L, whereas in the diffusive limit of L/L0≫ 1, it shows a power-law decay L-α with a scaling parameter α=3.81. The noise decay for single-walled carbon nanotubes is faster than that previously predicted based on a simple model because of the various electron-phonon scattering processes and the complex energy dependence of the phonon relaxation time.