Semnan University Press Progress in Physics of Applied Materials 2783-4794 7 2 2027 07 01 Investigation of Transport Properties of Nanoribbons of γ-graphyne and graphdiyne by Tight-binding Model 31 36 10997 10.22075/ppam.2026.41166.1227 EN Davoud Vahedi Fakhrabad Physics Department, Faculty of Science, University of Neyshabur, Neyshabur, Iran 0000-0002-6850-1157 Mahboubeh Yeganeh School of Engineering, Kosar University of Bojnord, Bojnord, Iran 0000-0002-8530-9669 Journal Article 2026 05 10 In this work, transport properties of nanoribbons of two carbon allotropes, including γ-graphyne and graphdiyne, were investigated using a tight-binding model in the non-equilibrium Green's function. We considered the carbon allotropes γ-graphyne, and graphdiyne, which respectively consist of 48 and 72 carbon atoms and are confined to semi-infinite leads of the same material. The electron transport coefficient showed an almost step-like quantized plateau for γ-graphyne, and graphdiyne reaching a transmission coefficient of up to 3 for both samples. The calculated band structure revealed the semiconducting behavior of γ-graphyne, and graphdiyne nanoribbons with band gap energies of 0.32 and 0.57 eV, respectively. The higher band gap of graphdiyne compared to γ-graphyne results in lower electronic conduction and thermal conductivity near the Fermi level; however, at chemical potentials further apart from the Fermi level which can be attained by gating or doping, higher electronic conduction and thermal conductivity in graphdiyne can be achieved compared to γ-graphyne. https://ppam.semnan.ac.ir/article_10997_8eb51d0a68e9373df41f88e5b551d4a3.pdf