Broadband and wide-angle invisibility with PT-symmetric 2D-Weyl semimetal

Abstract

Inspired by the magnificent features of two-dimensional (2D) materials that 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 are 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 are relatively small (usually around η=1) give rise to quite a lot of 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 concrete expedience to experimental realizations in this direction.