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year 27, Issue 2 (ICOP & ICPET 2021 2021)
ICOP & ICPET _ INPC _ ICOFS 2021, 27(2): 781-784 |
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Faramarzi V, Ahmadi V. The Role of Stone-Wales Defect on the Optical Properties of Armchair Graphene Nanoribbon. ICOP & ICPET _ INPC _ ICOFS 2021; 27 (2) :781-784
URL: http://opsi.ir/article-1-2478-en.html
URL: http://opsi.ir/article-1-2478-en.html
1- Department of Electrical and Computer Engineering, Tarbiat Modares University, Tehran, Iran.
Abstract: (972 Views)
In this study, the effect of Stone-Wales defect on the optical properties of the armchair graphene nanoribbon (GNR) including joint density of states and optical absorption spectra is investigated. By using the tight binding approximation, the energy band structure of nanoribbon is computed by considering the first neighbor sites. Using the energy band structure, the joint density of states calculated by Fermi's golden rule and band energy structures. By calculating the optical matrix elements and interband transition rule, the optical conductivity of the GNR is calculated. optical conductivity of nanoribbon is analyzed in the presence of Stone-Wales defects within different locations in GNR structure and compared with GNR with no defect state. The numerical result shows that by applying defect to the metallic type of the armchair GNR, the number of allowed optical interband transitions can be increased resulting in a broader range of optical absorption and also increasing the optical conductivity in the infrared range of incident energies.
Keywords: Graphene nanoribbon, Tight-binding, Stone-Wales Defect, Joint density of state, optical conductivity
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