Multiparticle complexes in encapsulated monolayers of transition metal dichalcogenides
Bisti V.E.1, Golyshkov G. M.1,2, Brichkin A. S.1, Chernrnko A. V.1
1Osipyan Institute of Solid State Physics RAS, Chernogolovka, Russia
2Moscow Institute of Physics and Technology (National Research University), Dolgoprudny, Moscow Region, Russia
Email: bisti@issp.ac.ru, grig986@yandex.ru, brich@issp.ac.ru, chernen@issp.ac.ru
The formation of multiparticle complexes in structures consisting of monolayers of transition metal dichalcogenides encapsulated by hexagonal boron nitride was studied. The binding energies of trions and excitons localized on charged impurities were calculated for interactions considered as charge-dipole interactions at long distances and approximated in two different ways at short distances. The range of polarizability values was chosen so that the obtained binding energies of the complexes were close to those observed experimentally. Comparison of the calculations allowed us to estimate the permissible range of exciton polarizability and identify the most realistic approximation of the dipole-charge interaction at short distances. The electron concentration was estimated from the intensity ratio of excitons and multiparticle complexes in the reflectance spectrum. Keywords: transition metal dichalcogenides, boron nitride, trions and excitons.
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