Sizable band gap in organometallic topological insulator |
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| Institution: | 1. Department of Physics, College of Agriculture and Natural Sciences, U.C.C, Ghana;2. Department of Mathematics, College of Agriculture and Natural Sciences, U.C.C, Ghana;1. Department of Mechanical Engineering, Najafabad Branch, Islamic Azad University, Najafabad, Iran;2. Department of Mechanical Engineering, Isfahan University of Technology, Isfahan, Iran;3. Fluid Mechanics, Thermal Engineering and Multiphase Flow Research Lab, Department of Mechanical Engineering, Faculty of Engineering, King Mongkut''s University of Technology Thonburi, Bangmod, Bangkok 10140, Thailand;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. Service Chimie-Physique, Université libre de Bruxelles, Brussels, Belgium;2. Thermodynamics of Irreversible Phenomena, Université de Liège, Liège, Belgium |
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| Abstract: | Based on first principle calculation when Ceperley–Alder and Perdew–Burke–Ernzerh type exchange-correlation energy functional were adopted to LSDA and GGA calculation, electronic properties of organometallic honeycomb lattice as a two-dimensional topological insulator was calculated. In the presence of spin–orbit interaction bulk band gap of organometallic lattice with heavy metals such as Au, Hg, Pt and Tl atoms were investigated. Our results show that the organometallic topological insulator which is made of Mercury atom shows the wide bulk band gap of about ∼120 meV. Moreover, by fitting the conduction and valence bands to the band-structure which are produced by Density Functional Theory, spin–orbit interaction parameters were extracted. Based on calculated parameters, gapless edge states within bulk insulating gap are indeed found for finite width strip of two-dimensional organometallic topological insulators. |
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| Keywords: | Spin–orbit interaction Organometallic lattice Topological insulator Edge states Density functional theory |
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