The effect of local electronic interaction on the optical properties of boron–nitride nanotubes |
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| Institution: | 1. Faculty of Engineering, Shahrekord University, Shahrekord, Iran;2. Nanotechnology Research Center, Shahrekourd University, Shahrekord, Iran;1. Department of Physics, Cumhuriyet University, 58140 Sivas, Turkey;2. Grupo de Materia Condensade-UdeA, Instituto de Fisica, Facultad de Ciencias Exactas y Naturales, Universidad de Antioquia UdeA, Calle 70 No. 52-21, Medellín, Colombia;3. Facultad de Ciencias, Universidad Autonóma del Estado de Morelos, Ave. Universidad 1001, CP 62209, Cuernavaca, Morelos, Mexico;4. Department of Physics, Dokuz Eylül University, 35160 Buca, ?zmir, Turkey;1. Department of Physics, University of Calcutta, 92 Acharya Prafulla Chandra Road, Kolkata 700009, India;2. Department of Condensed Matter and Materials Science, S.N. Bose National Centre for Basic Sciences, Block JD, Sector III, Salt Lake, Kolkata 700098, India;3. Department of Physics, Indian Institute of Science Education and Research, Pune Sai Trinity Building, Pashan, Pune 411021, India;4. Department of Physics and Astronomy, University of Uppsala, Uppsala, Sweden;1. Department of Nano Manufacturing Technology, Nano-Mechanical System Research Division, Korea Institute of Machinery & Materials, 104, Jang-dong, Yuseong-gu, Daejeon 305-343, Republic of Korea;2. Department of Nano Mechanics, Nano-Mechanical System Research Division, Korea Institute of Machinery & Materials, 104, Jang-dong, Yuseong-gu, Daejeon 305-343, Republic of Korea |
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| Abstract: | We investigate the behavior of optical absorption of boron–nitride nanotubes (6,0) in the context of Hubbard model at the paramagnetic sector. GW approximation has been implemented in order to make self-energy matrix of electronic system. Afterwards, the real and imaginary parts of transverse dielectric functions have been obtained using linear response theory. The results show that the frequency gap in the optical absorption decreases with Coulomb repulsion strength. Moreover the results show that the local Coulomb interaction leads to the appearance of the excitonic effects in the optical spectrum. Finally the effects of electronic concentration on the frequency behavior of imaginary part of dielectric function have been investigated. |
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| Keywords: | Boron–nitride Optical conductivity Hubbard model Green?s function |
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