## Binding energy and decaytime of exciton in dielectric medium

European Physical Journal B, cilt.94, sa.1, ss.1-7, 2021 (SCI İndekslerine Giren Dergi)

• Yayın Türü: Makale / Tam Makale
• Cilt numarası: 94 Konu: 1
• Basım Tarihi: 2021
• Doi Numarası: 10.1140/epjb/s10051-020-00030-6
• Dergi Adı: European Physical Journal B
• Sayfa Sayıları: ss.1-7

#### Özet

We developed a unique model for exciton in monolayer medium with an effective dielectric constant ${ϵ}_{eff}$ (in which the monolayer material is placed on a substrate such as fused silica glass or $Si{O}_{2}$ in experiments). Our model was based on an exact solution of the corresponding fully-covariant two-body Dirac-Coulomb type equation. For singlet quantum state of a static electron-hole pair in such a medium, we obtained a non-perturbative frequency spectrum composed of real and imaginary parts. We obtained explicit expressions for practical calculations of binding energy and decaytime of such a system. The results show that one can actively tune both binding energy and decaytime of an exciton during photo-excitation experiments by adjusting the value of ${ϵ}_{eff}$. We think that our calculations and approaches eliminate cross-talk in the literature and explain the discrepancy between experimental results of binding energy of an exciton for different substrates.