Figure 7.

Real parts of dielectric function ${\epsilon }_1(\omega )$ in xy plane and along z direction, versus photon energy: (a) pristine monolayer CSe; (b–d) S-doping at concentrations of 1.56%, 2.78% and 6.25%, respectively; (e) O-doping at 6.25%; (f) Te-doping at 6.25%.