Role of incoherent pumping field on absorption–dispersion properties of probe pulse in a graphene nanostructure under external magnetic field |
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| Institution: | 1. Department of Physics, University of Guilan, Rasht, Iran;2. Institute of Theoretical Physics and Astronomy, Vilnius University, A. Gostauto 12, LT-01108 Vilnius, Lithuania;1. Vietnam Institute of Educational Sciences, 101 Tran Hung Dao Str., Ha Noi City, Viet Nam;2. Center for Theoretical and Computational Physics, Hue University''s College of Education, 34 Le Loi Str., Hue City, Viet Nam;3. Department of Physics, Sai Gon University, 273 An Duong Vuong Str., District 5, Ho Chi Minh City, Viet Nam;1. Faculty of Electrical Engineering, Czestochowa University Technology, Armii Krajowej 17, Czestochowa, Poland;2. Physics and Astronomy Department, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia;3. The Hakubi Center for Advanced Research, Kyoto University, Nishikyo-ku, Kyoto 615-8520, Japan;4. Department of Electronic Science and Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8520, Japan;5. College of Food and Bioengineering, Jimei University, Xiamen 361021, China;6. Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8520, Japan;7. Research Chair of Exploitation of Renewable Energy Applications in Saudi Arabia, Physics & Astronomy Dept., College of Science, King Saud University, P.0.Box 2455, Riyadh 11451, Saudi Arabia;1. Department of Optical Science and Engineering, and Shanghai Ultra-Precision Optical Manufacturing Engineering Center, Fudan University, Shanghai 200433, China;2. Thin Film Optoelectronic Technology Center, Chinese Academy of Science, Shanghai 201210, China |
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| Abstract: | The optical properties of weak probe light based on quantum coherence and interference in Landau-quantized graphene nanostructure driven by two coherent fields and incoherent pumping field is investigated. The linear dynamical properties of the graphene by means of density matrix method and perturbation theory are discussed. It is found that under certain condition and for appropriate choosing the parameters of the medium, the absorption, dispersion, group index of the weak probe light can be controlled. Moreover, it is shown that by means of incoherent pumping field the superluminal light propagation in the system is accompanied by amplification to make sure that the probe field is amplified as it passes through the system. Moreover, it is observed that the probe amplification can be obtained in the presence or absence of population inversion by properly choosing of system’s parameters. We hope that these results may have useful in the future quantum communicational system and networks. |
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| Keywords: | Graphene nanostructure Absorption Dispersion Group velocity Population inversion Incoherent pumping field |
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