The similarity between two-dimensional magnetoexcitons and the excitons in transition metal dichalcogenides

Abstract

The exchange e-h Coulomb scattering takes place with the annihilation and the creation of the e-h pairs with the resultant electronic charges equal to zero. During the direct Coulomb scattering the electron and a hole remain in the same energy bands interacting as a charged particles. They have dipole-dipole interaction, when the interband dipole moments c v r − are different from zero. It happens when the crystals have the dipole active optical quantum transitions.