Linear and nonlinear exciton polariton dispersion in MoS2 nanosheets and its nickel doping dependence.

In this paper, we study the influence of Ni-doping on A- and B-exciton polariton dispersion in MoS 2 nanosheets. In particular, we have calculated the effect of the Ni-concentration on the energy dispersion and therefore we have deduced the effective masses by adjusting the hopping parameter. The E A , E B -exciton transition energies and the hopping parameter are discerned from the PL of Ni-MoS 2 nanosheets. It is shown that the Ni changes considerably the bandgap and as a result the electronic band structure, the effective masses, the optical transition, and the hopping term. We found that the increasing concentration of Ni-dopant can modulate and favors the mixture of A- and B-exciton peaks of MoS 2 nanosheets. The diverging Ni-concentration of A- and B-exciton polariton dispersion are also discerned and discussed. Finaly, we can predict that these changes caused by the influence of Ni-doping can be used in most applications involving exciton polariton dispersion for photonics and optoelectronics devices.