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Quasiparticle band structure study of ternary mixed chalcogenide Bi2Te2S as topological insulator

Alhassan, Shuaibu and Rahman, Md. Mahmudur and Zainuddin, Hishamuddin and Talib, Zainal Abidin and Muhida, Riza and Setiyanto , Henry (2015) Quasiparticle band structure study of ternary mixed chalcogenide Bi2Te2S as topological insulator. Chalcogenide Letters, 12 (2). pp. 85-90. ISSN 1584-8663

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Abstract

In this paper, ternary mixed chalcogenide Bi2Te2S has been investigated using first principle within the density functional theory (DFT) calculation as well as many body perturbation theory within the GW quasiparticle approximations. For the DFT calculation, we have used generalize gradient approximations (GGA) as exchange correlation function and found that, Bi2Te2S has a narrow band gap with a band gap of about 0.058eV, while or the GW calculation, we have evaluated both the quarsi bands structure, and absorption spectrum using random phase approximation (RPA). From the results we have observed that the GW corrections to the DFT-Kohn-Sham eigenvalues increase the fundamental band gap to 0.099 eV showing the effect of electron-phonon coupling present in the structure of Bi2Te2S, while, for the absorption spectrum, it exhibits a close value in agreement with the theoretical results of similar compounds reported by (Anjan A. Reijnders, et. al 2014).

Item Type:Article
Keyword:Density functional theory; GW quarsi particle approximation; Topological insulators; Mixed chalcogenide
Faculty or Institute:Faculty of Science
Publisher:National Institute of Research and Development of Materials Physics
ID Code:35141
Deposited By: Nurul Ainie Mokhtar
Deposited On:30 Dec 2015 19:13
Last Modified:30 Dec 2015 19:14

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