Magnetothermal Properties of Exciton In TMD_ WS2 Monolayer

Abstract

Abstract: The Hamiltonian of an exciton in a thin layer of WS₂-transition metal dichalcogenide (TMD) was solved by the 1/N expansion method, and the corresponding exciton bound-state energies were obtained. The Hamiltonian describes an electron-hole particle system interacting through an attractive Rytova-Keldysh potential ( ) in a sheet of WS₂, which is presented in an external uniform magnetic field applied perpendicular to the material sheet plane. We used the computed eigenenergies to calculate the partition function, which depends on the temperature and magnetic field. We calculated the magnetic and thermal quantities of WS₂ TMD material sheet for various values of magnetic field strength and temperature range. The comparisons show that the calculated exciton energy spectra against experimental and theoretical corresponding results are in very good agreement. We have displayed the dependence of magnetization, susceptibility, entropy, and heat capacity as a function of magnetic field and temperature. The paramagnetic behavior of materials over a wide range of magnetic fields was considered. In addition, the density of states (DOS) of TMD-WS₂ material was calculated, and the resulting DOS plot shows an oscillator peak behavior for various ranges of the magnetic field strengths.