Abstract
The present paper analyzes the density of states (DOS), and optical conductivity of the non-hexagonal S-graphene system as a stable allotrope of carbon in the presence of an external exchange magnetic field (EEMF) using the tight-binding (TB) approach. Our results show that with the increase of the EEMF, the energy band gap decreases, and Van Hove's singularity is divided into two separate peaks. Also, the optical conductivity of the S-graphene sheet has been explored by applyingthe current–current time correlation function in the Kubo formula from the linear response theory and also using Green’s function approach. On the other hand, we reported the frequency dependence of optical conductivity for various values of the EEMF, hole and electron doping, and temperature, which have been examined in detail. The results show that, in the zero frequency range, different temperatures lead to the appearance of a Drude response, which is the result of the intra-band transfer of electrons. Also, the dispersion speed in the conduction band (due to the increase in electron density) increases with the increase in electron doping, which causes the Pauli blocking phenomenon and as a result decreases optical absorption. Due to the raise of intra-band and inter-band electronic transitions, optical absorption is promoted with the increase of absorption frequency.
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All data generated during this study are included in this published article. In detail, we calculated the Optical properties of non-hexagonal S-graphene by using the tight-binding (TB) and equilibrium Green’s function method and studied the effect of applying exchange magnetic fields and hole/electron doping on the optical properties of S-graphene monolayer. The more calculations detail described in the manuscript will be freely available to any researcher wishing to use them by connecting to the corresponding author.
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All authors contributed to the study's conception and design. The numerical modeling, analysis, interpretation of data, and writing were done by EN, and BA planned and organized the project and substantively checked of data and results, and reviewed and edited. All authors read and approved the final manuscript.
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Norian, E., Astinchap, B. Optical properties of non-hexagonal S-graphene: the role of exchange magnetic fields and hole/electron doping. Opt Quant Electron 55, 547 (2023). https://doi.org/10.1007/s11082-023-04822-9
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DOI: https://doi.org/10.1007/s11082-023-04822-9