Transport Limitation Induced by Electron-Electron Interaction in Single-Walled Carbon Nanotube Films.

One-dimensional conductors, such as single-walled carbon nanotubes (SWNTs), offer an excellent platform for investigating the dimensionality-related effects. In this work, we demonstrate that the non-Drude behavior observed in the far-infrared spectra of SWNT films is a direct manifestation of electron-electron interactions characteristic of one-dimensional transport. Our results reveal a linear frequency dependence of the electron relaxation rate, in agreement with predictions from Tomonaga-Luttinger theory. Employing a modified microscopic model, we describe the conductivity spectra of SWNT films across the entire optical range and derive the theoretical lower bound for their dc sheet resistance. These findings contribute to a deeper understanding of the physics of one-dimensional materials and offer valuable insights for the development of SWNT-based transparent electrodes.