Excitons and Trions in Bilayer van der Waals Heterostructures
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Excitons and trions in bilayer structures based on transition metal dichalcogenides are theoretically studied. Expressions for the effective potential of interparticle interaction in such a system with allowance for a significant dielectric contrast in the heterostructure are obtained. Simple and physically justified variational functions for electron–hole complexes are proposed. A variational calculation of the exciton and trion binding energies as functions of the interlayer distance, taking into account the specific features of the screening of the Coulomb interaction, is performed. The accuracy of the variational approach is confirmed by direct numerical calculation of the exciton binding energy as a function of the interlayer distance.
Keywords:spatially indirect exciton trion monolayers of transition metal dichalcogenides bilayer structures Rytova–Keldysh potential
The author is grateful to M.M. Glazov and A.V. Rodina for discussions and useful questions, which helped them improve the work.
This work was supported by the Russian Science Foundation (project no. 19-12-00273).
CONFLICT OF INTEREST
The author has no conflicts of interest related to the material presented in this paper.
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