  We suggest graphene and a two-dimensional (2D) Weyl semimetal (WSM) as 2D
materials for the realization of a broadband coherent perfect absorber (CPA)
respecting overall PT-symmetry. We also demonstrate the conditions for mutually
equal amplitudes and phases of the left and right incoming waves to realize a
CPA. 2D materials in our system play the role to enhance the absorption rate of
a CPA once the appropriate parameters are inserted in the system. We show that
a 2D WSM is more effective than graphene in obtaining the optimal conditions.
We display the behavior of each parameter governing the optical system and show
that optimal conditions of these parameters give rise to enhancement and
possible experimental realization of a broadband CPA-laser.
