Regular Article - Solid State and Materials
Binding energy and decaytime of exciton in dielectric medium
Medical Imaging Techniques, Simav Vocational School of Health Services, Kutahya Health Sciences University, TR-43500, Kutahya, Turkey
2 Department of Physics, Faculty of Science, Akdeniz University, TR-07058, Antalya, Turkey
Accepted: 20 November 2020
Published online: 12 January 2021
We developed a unique model for exciton in monolayer medium with an effective dielectric constant (in which the monolayer material is placed on a substrate such as fused silica glass or 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 . 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.
© EDP Sciences, SIF and Springer-Verlag GmbH Germany, part of Springer Nature 2021