Coulomb screening effects on the optoelectronic far-infrared properties of spatially separated few-layer graphene |
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| Affiliation: | 1. School of Physics and Optoelectronic Engineering, Nanjing University of Information Science and Technology, Nanjing 210044, China;2. Institute of Environmental Health and Pollution Control, School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China;1. Department of Optics and Spectroscopy, Voronezh State University, Voronezh 394006, Russia;2. B.I. Stepanov Institute of Physics, National Academy of Sciences of Belarus, Minsk 220072, Belarus;3. P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991, Russia;1. Al Imam Mohammad Ibn Saud Islamic University (IMSIU), College of Science, Department of Physics, Riyadh, Saudi Arabia;2. The Abdus Salam International Centre for Theoretical Physics, Strada Costiera 11, Miramare-Trieste, Italy;3. Mathematics Department, Faculty of Science, Sohag University, Sohag, Egypt;1. Laboratoire des Matériaux Composites, Polymères et Céramiques, FSS 3018, Université de Sfax, Tunisia;2. Laboratoire de Génie Textile, Université de Monastir, ISET Ksar Hellal, Tunisia;3. College of Engineering, Industrial Engineering Department, Taiba University, Saudi Arabia;4. Laboratoire IMMM, Université du Maine, Le Mans, France;1. Physics Department, Faculty of Science and Science Education, School of Science, University of Sulaimani, Kurdistan Region, Iraq;2. Science Institute, University of Iceland, Dunhaga 3, IS-107 Reykjavik, Iceland;3. Department of Mechanical Engineering, National United University, 1, Lienda, Miaoli 36003, Taiwan;4. School of Science and Engineering, Reykjavik University, Menntavegur 1, IS-101 Reykjavik, Iceland |
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| Abstract: | We investigate the longitudinal optical conductivity of spatially separated few-layer graphene analytically and numerically. Each layer could be monolayer or bilayer graphene. The density–density correlation function has been screened by the dielectric function using the random phase approximation, which includes the inter-layer Coulomb coupling. In the presence of the potential function between the layers, the carrier densities in each layer can be tuned respectively. In these two-dimensional layered structures, the main contributions to the optical conductivity are from the intra- and inter-band transition channels in a same layer. In the infrared region, the Drude optical conductivity was observed by the unscreened intra-band transition process. But in the presence of the inter-layer Coulomb interaction, one peak structure of the optical conductivity is observed which can be modified by the dielectric environment. From the number of turning points and the turning positions, the carrier density, the Fermi wavevector, and the layered structure can be determined. |
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| Keywords: | Few-layer graphene Optoelectronic property Screening effect |
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