Edge States and Stacking Effects in Nanographene Systems

TL;DR

This paper investigates how different stacking arrangements in bilayer graphene nanoribbons affect their electronic edge states and band structures using a tight binding model.

Contribution

It introduces a comparative analysis of alpha and beta stacking effects on edge states and band splitting in bilayer graphene nanoribbons.

Findings

Band splitting occurs in alpha stacking.

Wave number splitting is observed in beta stacking.

Local density of states avoids sites with inter-layer hopping.

Abstract

Bilayer graphene nanoribbon with zigzag edge is investigated with the tight binding model. Two stacking structures, alpha and beta, are considered. The band splitting is seen in the alpha structure, while the splitting in the wave number direction is found in the beta structure. The local density of states in the beta structure tend to avoid sites where inter-layer hopping interactions are present.