Binding energy and decaytime of exciton in dielectric medium
EUROPEAN PHYSICAL JOURNAL B, cilt.94, sa.1, 2021 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 94 Sayı: 1
- Basım Tarihi: 2021
- Doi Numarası: 10.1140/epjb/s10051-020-00030-6
- Dergi Adı: EUROPEAN PHYSICAL JOURNAL B
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Chemical Abstracts Core, Compendex, INSPEC, zbMATH
- Akdeniz Üniversitesi Adresli: Evet
Özet
We developed a unique model for exciton in monolayer medium with an effective dielectric constant Eeff (in which the monolayer material is placed on a substrate such as fused silica glass or SiO2 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 Eeff. 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.