Vol. 7, Issue 1, Part B (2025)

Carbon nanotubes (CNTs) and graphene nanoribbons (GNRs) are pivotal in Nano electronics due to their unique quantum transport properties, influenced by electron-electron (e-e) and electron-phonon (e-ph) interactions. This study investigates these effects in a (10,0) zigzag CNT and a 10-armchair GNR using tight-binding models and non-equilibrium Green’s function (NEGF) simulations. We quantify how e-e interactions, driven by Coulomb effects, and e-ph scattering, arising from lattice vibrations, impact conductance and transmission. Results reveal that CNTs exhibit higher conductance (~1.5 G₀, where G₀= 2e²/h) due to weaker e-e scattering (~10¹¹s⁻¹) facilitated by their 1D symmetry and screening. In contrast, GNRs show reduced conductance (~1.0 G₀) due to stronger e-e interactions (~5 × 10¹¹s⁻¹) from edge states and e-ph scattering (10¹²-10¹³s⁻¹) enhanced by edge-localized phonons. At 300 K, e-ph coupling dominates, reducing transmission by 30% in CNTs and45%inGNRs, as shown in Fig. 1. Lowering temperature to 77 K mitigates e-ph effects, boosting conductance significantly, though GNRs remain limited by edge contributions. These findings highlight CNTs’ suitability for high-conductance quantum devices and suggest edge engineering (e.g., passivation) to improve GNR performance. By elucidating interaction effects, this work provides a framework for optimizing carbon nanostructures in quantum electronics, addressing scalability and efficiency challenges in next-generation technologies.