Chiral symmetry and its manifestation in optical responses in graphene: interaction and multi-layers

TL;DR

This paper explores how chiral symmetry influences optical responses and many-body physics in graphene, including multilayer structures, highlighting its fundamental role in topological and anomalous behaviors.

Contribution

It provides a comprehensive analysis of chiral symmetry's impact on optical properties and multilayer graphene, linking symmetry principles with observable phenomena.

Findings

Chiral symmetry underpins topologically stable Dirac cones.

Optical responses in graphene are directly affected by chiral symmetry.

Multilayer graphene's optical properties relate to its chiral symmetry.

Abstract

Chiral symmetry, fundamental in the physics of graphene, guarantees the existence of topologically stable doubled Dirac cones and anomalous behaviors of the zero-energy Landau level in magnetic fields. The crucial role is inherited in the optical responses and many-body physics in graphene, which are explained in this paper. We also give an overview of multilayer graphene from the viewpoint of the optical properties and their relation with the chiral symmetry.