Negative Poisson's Ratio in Phagraphene

TL;DR

This study uses numerical simulations to explore the elastic properties of phagraphene, revealing that its Poisson's ratio can be positive or negative depending on its configuration, with isotropic or anisotropic behavior.

Contribution

It provides the first detailed simulation analysis of phagraphene's elastic properties, highlighting the dependence on its planar or nonplanar structure.

Findings

Poisson's ratio is positive in planar phagraphene

Poisson's ratio is negative in nonplanar phagraphene

Elastic properties are isotropic in planar and anisotropic in nonplanar configurations

Abstract

We present the results of numerical simulation of elastic properties of phagraphene, a recently predicted but not synthesized yet quasi-two-dimensional allotrope of graphene. We show that the Poisson'ss ratio is positive for the planar configuration of phagraphene and negative for the nonplanar one. Both the Poisson's ratio and the Young's modulus are isotropic for the planar phagraphene and strongly anisotropic for the nonplanar phagraphene.