  Inspired by the magnificent features of two-dimensional (2D) materials which
aroused much of the interest in recent materials science research, we study
PT-symmetric 2D Weyl semimetal (WSM) to reveal the broadband and wide-angle
invisible configurations in a PT-symmetric optical slab system. Desired
unidirectional reflectionlessness and invisibility phenomena is obtained by the
optimal control of system parameters. We unravel the mystery of broadband and
wide-angle invisibility in regular slab materials with finite refractive
indices by means of the plenary expressions. We show that materials whose
refractive indices relatively small (usually around $\eta =1$) give rise to
quite a lot broadband and wide-angle (almost all incidence angles) invisible
configurations. This is not observed with any 2D material other than 2D WSMs.
Our findings suggest a concrete expedience to experimental realizations in this
direction.
