# Broadband Coherent Perfect Absorber with PT-Symmetric 2D-Materials

## TL;DR

This paper proposes using 2D materials like graphene and Weyl semimetals to create a broadband coherent perfect absorber with PT-symmetry, enhancing absorption and enabling potential CPA-laser applications.

## Contribution

It introduces a novel PT-symmetric broadband CPA design utilizing 2D materials, highlighting the superior effectiveness of Weyl semimetals over graphene.

## Key findings

- Weyl semimetals outperform graphene in CPA efficiency
- Optimal parameters lead to broadband CPA-laser potential
- Conditions for equal amplitude and phase of incoming waves

## Abstract

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.