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Optical Absorption and Tsallis Entropy of Polaron in Monolayer Graphene

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Abstract

We studied the effect of polar vibration modes on optical absorption of polaron and the rate of disorder in a graphene monolayer. Our investigation focused more particularly on the role played by phonons. We found that the amplitude of optical absorption decreases with increasing photon energy and with increasing magnetic field. We also found that the rate of local disorder in the system increases with increasing temperature and with increasing graphene-substrate distance. However, it decreases with the increase in magnetic field. These observations show that the absorption of a polaron by the photon creates a relative disorder in the graphene lattice. It is also shown that entropy and optical absorption of polaron strongly depend on the type of substrates.

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Authors and Affiliations

  1. Laboratory of Condensed Matter-Electronics and Signal Processing (LAMACET), Department of Physics, Faculty of Science, University of Dschang, P.O. Box 67, Dschang, Cameroon

    C. Kenfack-Sadem, M. F. C. Fobasso, A. J. Fotue & L. C. Fai

  2. Laboratory of Mechanics, Faculty of Science, University of Yaoundé I, P.O. Box 812, Yaoundé, Cameroon

    S. Mounbou & S. I. Fewo

  3. International Chair in Mathematical Physics and Applications (ICMPA-UNESCO Chair), University of Abomey-Calavi, 072 P.O. Box 50, Cotonou, Benin

    C. Kenfack-Sadem

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  1. C. Kenfack-Sadem
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  2. S. Mounbou
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Kenfack-Sadem, C., Mounbou, S., Fewo, S.I. et al. Optical Absorption and Tsallis Entropy of Polaron in Monolayer Graphene. J Low Temp Phys 200, 173–186 (2020). https://doi.org/10.1007/s10909-020-02478-3

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