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Optical signature of bipolaron in monolayer transition metal dichalcogenides: all coupling approach

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Abstract

We studied the optical signature of bipolaron and its effects on the bandgap modulation in the single-layer Transition Metal Dichalcogenides (TMDs) under magnetic field. Using the Huybrecht method, we derived the ground state energies in the modified zero Landau levels for all Fröhlich coupling constants. We take into account both intrinsic longitudinal optical phonon modes and surface optical phonon modes induced by the polar substrate. We observed that the higher the coupling strength, the stronger is the magnetic field effect. The highest amplitude of the bandgap modulation is obtained for the MoS2 monolayer and the lowest with the WSe2 monolayer. We also found that the bipolaron is stable in TMDs. It is seen that the optical absorption presents the threshold values and respectively increases for WSe2, MoSe2, WS2 and MoS2.

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Authors and Affiliations

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

    C. Kenfack-Sadem & M. F. C. Fobasso

  2. Laboratoire de Mécanique, Matériaux et Structures, Département de Physique, Université de Yaoundé 1, BP 812, Yaoundé, Cameroon

    J. V. Nguepnang

  3. Département de Physique, Ecole Normale Supérieure, Université de Yaoundé 1, BP 42, Yaoundé, Cameroon

    A. Kenfack-Jiotsa

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

    C. Kenfack-Sadem

  5. Institute of Condensed Matter Physics, College of Mathematics and Physics, Inner Mongolia University for Nationalities, Tongliao, China

    Y. Sun

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  1. J. V. Nguepnang
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Nguepnang, J.V., Kenfack-Sadem, C., Kenfack-Jiotsa, A. et al. Optical signature of bipolaron in monolayer transition metal dichalcogenides: all coupling approach. Opt Quant Electron 53, 728 (2021). https://doi.org/10.1007/s11082-021-03365-1

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