Fundamental properties of Alkali-intercalated bilayer graphene nanoribbons

TL;DR

This study uses first-principles calculations to explore the electronic, magnetic, and structural properties of alkali-metal intercalated graphene nanoribbons, revealing tunable behaviors from semiconducting to metallic states.

Contribution

It provides a comprehensive analysis of how alkali-metal intercalation affects GNRs' properties, including stability, magnetization, and electronic behavior, with implications for experimental applications.

Findings

Transformation from semiconducting to metallic behavior

Edge passivation influences stability and magnetization

Intercalation modifies electronic and magnetic properties

Abstract

Along with the inherent remarkable properties of graphene, adatom-intercalated graphene-related systems are expected to exhibit tunable electronic properties. The metal-based atoms could provide multi-orbital hybridizations with the out-of-plane pi-bondings on the carbon honeycomb lattice, which dominates the fundamental properties of chemisorption systems. In this work, using the first-principles calculations, the feature-rich properties of alkali-metal intercalated graphene nanoribbons (GNRs) are investigated, including edge passivation, stacking configurations, intercalation sites, stability, charge density distribution, magnetic configuration, and electronic properties. There exists a transformation from finite gap semiconducting to metallic behaviors, indicating enhanced electrical conductivity. They arise from the cooperative or competitive relations among the significant chemical bonds, finite-size quantum confinement, edge structure, and stacking order. Moreover, the decoration of edge structures with hydrogen and oxygen atoms is considered to provide more information about the stability and magnetization due to the ribbon' effect. These findings will be helpful for experimental fabrications and measurements for further investigation of GNRs-based materials.