Variationally optimized orbital approach to trions in two-dimensional materials

In this work, trions in two-dimensional (2D) space are studied by the variational method with trial wavefunctions being constructed 2D slater-type orbitals. Via method, trion energy levels and can be calculated efficiently fairly good accuracy. We first apply to study a hydrogen-like system respect wide range of mass ratios screening lengths. find that ground-state is bound for whole parameter range, an excited-state antisymmetric permutation electrons finite angular momentum large electron–hole or long The binding energies present agree well those more sophisticated but computationally demanding methods. then calculate various monolayer transition metal dichalcogenides (TMDCs) using inclusion exchange (EHX) interaction. For TMDCs, we found effect EHX significant determining possible existence stable trions.