Temperature dependence of phonon-induced current noise in micrometer-long metallic carbon nanotubes
Year: 2025
Type: article
Abstract: We theoretically investigate the temperature dependence of phonon-induced current noise in micrometer-long metallic single-walled carbon nanotubes using large-scale time-dependent quantum transport simulations. We find that both the average current and its variance exhibit power-law dependencies on temperature in the high-temperature diffusive regime: 〈J K〉 ∝ 1/T and 〈 Δ J K 2 〉 ∝ 1 / T 2 , respectively. The observed 1/T 2 behavior of the current variance stands in stark contrast to the equilibrium Johnson–Nyquist noise, which increases linearly with temperature. Furthermore, we show that the current variance follows a universal scaling law as a function of the normalized channel length L/L 0, where L 0 denotes the phonon-limited mean free path. This behavior is quantitatively explained by a Gamma-distributed probability density function for the current, combined with a phenomenological model for electronic transport incorporating dephasing effects due to electron–phonon scattering.
Authors: Aina Sumiyoshi, Takahiro Yamamoto
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $2,210
OpenAlex ID: W4413957353