Article

Mechanical, Electronic, and Optical Properties of 8-16-4 Graphyne: A 2D Carbon Allotrope with Dirac Cones

Raphael M. TromerApplied Physics Department, State University of Campinas, Campinas-SP 13083-970, BrazilMarcelo Lopes PereiraUniversity of Brasília, Faculty of Technology, Department of Electrical Engineering, Brasília 70910-970, BrazilK. A. L. LimaDepartment of Physics, Federal University of Rio Grande do Norte, Natal, Rio Grande do Norte 59078-970, BrazilAlexandre F. FonsecaApplied Physics Department, State University of Campinas, Campinas-SP 13083-970, BrazilL. R. da SilvaDepartment of Physics, Federal University of Rio Grande do Norte, Natal, Rio Grande do Norte 59078-970, BrazilDouglas S. GalvãoApplied Physics Department, State University of Campinas, Campinas-SP 13083-970, BrazilLuiz Antônio RibeiroUniversity of Brasília, Institute of Physics, Brasília-DF 70910-970, Brazil

2023en

ABI

Abstract

Graphene’s success has led to the theoretical prediction and experimental synthesis of various 2D carbon-based allotropes. To explore the mechanical, structural, electronic, and optical properties of 8-16-4 graphyne, we employed density functional theory using the GGA/PBE approach, ab initio molecular dynamics (AIMD), and classical reactive molecular dynamics simulations. Our AIMD results indicate that this material demonstrates excellent dynamical and thermal stabilities. It has a formation energy of −8.57 eV/atom and an elastic moduli of 262.37 GPa. Regarding its band structure, this graphyne analogue is a semimetal with two Dirac cones. It also exhibits transparency and intense optical activity in the infrared region. Notably, the band structure of 8-16-4 graphyne remains practically unchanged at moderate strain regimes. To our knowledge, this is the first known 2D carbon allotrope to exhibit such behavior.

Identifiers

DOI: 10.1021/acs.jpcc.3c01788

Citations and references

Cited by 20 references

Metrics — AkademScholar