Theory of ARPES in Graphene-Based Moir\'e Superlattices

TL;DR

This paper develops a theoretical model to evaluate how ARPES can be used to study the electronic properties of graphene-based moiré superlattices, complementing existing experimental techniques.

Contribution

It introduces a specific theoretical framework for ARPES in graphene moiré systems, aiding in resolving open questions about their electronic structure.

Findings

ARPEs can distinguish different electronic phases in moiré superlattices

The model applies to G/hBN and TBG systems

Provides guidance for future experimental investigations

Abstract

Graphene-based moir\'e superlattices are now established as an interesting platform for strongly-correlated many-electron physics, and have so far been characterized mainly by transport and scanning tunneling microscopy (STM) measurements. Motivated by recent experimental progress, we present a theoretical model study whose aim is to assess the potential of angle-resolved photoemission spectroscopy (ARPES) to resolve some of the many open issues in these systems. The theory is developed specifically for graphene on hexagonal boron nitride (G/hBN) and twisted bilayer graphene (TBG) moir\'e superlattices, but is readily generalized to any system with active degrees of freedom in graphene sheets.