Effective Landau Level Diagram of Bilayer Graphene

TL;DR

This paper constructs an empirical Landau level diagram for bilayer graphene's octet, integrating interaction effects to explain its quantum phenomena and serving as a foundation for future research.

Contribution

It provides the first comprehensive, interaction-inclusive Landau level diagram for bilayer graphene's octet, unifying various experimental observations.

Findings

Constructed an empirical Landau level spectrum for bilayer graphene

Explained occupation sequences, gap energies, and phase transitions

Serves as a basis for advanced theoretical and experimental studies

Abstract

The $E = 0$ octet of bilayer graphene in the filling factor range of -4 < $\nu$ < 4 is a fertile playground for many-body phenomena, yet a Landau level diagram is missing due to strong interactions and competing quantum degrees of freedom. We combine measurements and modeling to construct an empirical and quantitative spectrum. The single-particle-like diagram incorporates interaction effects effectively and provides a unified framework to understand the occupation sequence, gap energies and phase transitions observed in the octet. It serves as a new starting point for more sophisticated calculations and experiments.