Electronic thermal conductivity of armchair graphene nanoribbons and zigzag carbon nanotubes |
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| Affiliation: | 1. Department of Physics, Razi University, Kermanshah, Iran;2. Department of Physics, University of Missouri, Columbia, MO 65201, USA;3. Department of Physics, University of Colorado, Colorado Springs, CO 80918, USA;1. Mesoscopic and Multilayer Structures Laboratory, Department of Physics, Faculty of Science, University of Dschang, Cameroon;2. Department of Physics, Higher Teachers'' Training College, The University of Maroua, PO BOX 55 Maroua, Cameroon;1. Department of Applied Physics, Nanjing University of Information Science and Technology, Nanjing 210044, China;2. Institute of Applied Physics and Materials Engineering, FST, University of Macau, China;1. Department of Physics, Bilkent University, Ankara 06800, Turkey;2. Molecular Engineering Laboratory, at the Department of Physics, University of Patras, Patras, GR-26500, Greece;3. Centre of Excellence in Solid State Physics, University of the Punjab, Lahore, Pakistan |
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| Abstract: | Through the Green's function formalism and tight-binding Hamiltonian model calculations, the temperature dependent electronic thermal conductivity (TC) for different diameters of zigzag carbon nanotubes and their corresponding unzipped armchair graphene nanoribbons is calculated. All functional temperature dependencies bear crossovers, for which, at higher temperatures, nanotubes have a slightly higher TC than their derived nanoribbons, while below that crossover, both systems exhibit a significant coincidence over a moderate range of lower temperatures. Noticeably, TC decreases with increasing the width or diameter of the corresponding systems. Also, at low temperatures TC is proportional to the density of states around the Fermi level, and thus increasing for metal or semiconductors of narrower gap cases. |
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| Keywords: | Graphene nanoribbons Carbon nanotubes Thermal conductivity Tight-binding Green's function |
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