Broadband and Wide-Angle Invisibility with PT-Symmetric 2D-Weyl Semimetal

TL;DR

This paper demonstrates that PT-symmetric 2D Weyl semimetals can achieve broadband and wide-angle invisibility in optical systems, a feat not observed with other 2D materials, by controlling system parameters.

Contribution

It reveals the unique broadband and wide-angle invisibility properties of PT-symmetric 2D Weyl semimetals in optical slabs, advancing the understanding of 2D material-based invisibility.

Findings

Materials with small refractive indices enable broadband invisibility.

PT-symmetric 2D Weyl semimetals exhibit near all-angle invisibility.

Optimal parameter control achieves unidirectional reflectionlessness.

Abstract

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.