Optical absorption of zigzag single walled boron nitride nanotubes in axial magnetic field |
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| Affiliation: | 1. Physics Department, Faculty of Science, Malayer University, Malayer, Iran;2. Department of Nano Science, Kermanshah University of Technology, Kermanshah, Iran;1. Department of Physics, Mordovian Ogarev State University, Saransk 430005, Russia;2. Department of Chemistry, Mordovian Ogarev State University, Saransk 430005, Russia;1. Nanoscience Center, Department of Physics, University of Jyväskylä, P.O. Box 35, FI40014 Jyväskylä, Finland;2. Saha Institute of Nuclear Physics, 1/AF, Bidhannagar, Kolkata 700064, India;1. Department of Chemistry, Nankai University, Tianjin 300071, PR China;2. State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, PR China;1. Departamento de Física, CCEN, Universidade Federal da Paraíba, Caixa Postal 5008, 58051-900 João Pessoa, PB, Brazil;2. Instituto Federal da Bahia, Campus Vitória da Conquista, Av. Amazonas 3150, 45075-265 Vitória da conquista, BA, Brazil;1. Faculty of Nano and Bioscience and Technology, Persian Gulf University, Bushehr 75169, Iran;2. Department of Mathematics and Physics, Leibniz Universität Hannover, 30167 Hannover, Germany;3. Independent Researchers, Lyon, France |
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| Abstract: | 
We have investigated the effect of axial magnetic field on the band structure, dipole matrix elements and absorption spectrum in different energy ranges, using tight binding approximation. It is found that magnetic field breaks the degeneracy in the band structure and creates new allowed transitions in the dipole matrix which leads to creation of new peaks in the absorption spectrum. It is found that, unlike to CNTs which show metallic–semiconductor transition, the BNNTs remain semiconductor in any magnetic field strength. By calculation the diameter dependence of peak positions, we found that the positions of three first peaks in the lower energy region (E <5.3 eV) are proportional to n−2. In the middle energy region (7 < E < 7.5 eV) all (n, 0) zigzag BNNTs, with even and odd nanotube index, have two distinct peaks in the absence of magnetic field which these peaks may be used to identify zigzag BNNTs from other tube chiralities. For odd (even) tubes, in the middle energy region, applying the magnetic field leads to splitting of these two peaks into three (five) distinct peaks. |
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| Keywords: | Tight binding Boron nitride nanotube Optical absorption properties Axial magnetic field |
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