ENERGIES AND DIAMAGNETIC COEFFICIENTS OF EXCITON IN MONOLAYER WSe2

Tóm tắt

Two-dimensional exciton under a uniform magnetic field in monolayer transition-metal dichalcogenides (TMDCs) has been a fascinating problem for experimental and theoretical studies in the last decade due to its practical applications in electronic and optics devices. Specifically, there is significant interest in the diamagnetic coefficients of excitons in monolayer TMDCs, focusing on the monolayer WSe2 encapsulated by boron nitride (h-BN). The discrepancy between theoretical calculations and experimental data for the diamagnetic coefficient of an exciton in monolayer TMDCs requires further improvement in theory for this material property. This paper uses the so-called modulated perturbation method by combining the Rayleigh-Schrӧdinger perturbation theory with the Levi-Civita transformation and including a variational parameter. The advantage of the constructed method is demonstrated in calculating the exciton diamagnetic coefficient within the second order of approximation. The results are then compared with recent experimental ones.