The origin of Raman D Band: Bonding and Antibonding Orbitals in Graphene

TL;DR

This paper explains the physical origin of the Raman D band in graphene, linking it to bonding and antibonding orbitals, and reviews recent work on how the D band is activated at graphene edges.

Contribution

It provides a new understanding of the D band mechanism in graphene based on bonding and antibonding orbitals, clarifying its activation at edges.

Findings

D band related to bonding and antibonding orbitals

Activation mechanism at graphene edges

Clarification of D band's physical origin

Abstract

In Raman spectroscopy of graphite and graphene, the $D$ band at $\sim 1355$cm$^{-1}$ is used as the indication of the dirtiness of a sample. However, our analysis suggests that the physics behind the $D$ band is closely related to a very clear idea for describing a molecule, namely bonding and antibonding orbitals in graphene. In this paper, we review our recent work on the mechanism for activating the $D$ band at a graphene edge.