Ultra-high magnetic field study of the layer split bands in Graphite

TL;DR

This study uses ultra-high magnetic fields to spectroscopically investigate interlayer split bands in graphite, revealing their behavior aligns with a simple relativistic model based on key interlayer coupling parameters.

Contribution

First spectroscopic analysis of interlayer split bands in graphite at ultra-high magnetic fields, demonstrating their description via an asymmetric bilayer model and relativistic behavior.

Findings

Interlayer split bands $E_{1}$ and $E_{2}$ are well described by an asymmetric bilayer model.

Electrons and holes exhibit properties consistent with a simple relativistic model.

Small asymmetry in interlayer band gap observed.

Abstract

We report studies of the magnetospectroscopy of graphite into a new regime of high energies and ultra-high magnetic fields which allows us to perform the first spectroscopic studies of the interlayer split off bands, $E_{1}$ and $E_{2}$. These bands can be well described by an asymmetric bilayer model and have only a small interlayer band gap asymmetry. We show that all of the properties of the electrons and holes can be described by a simple relativistic behaviour determined by $\gamma_{0}$ and $\gamma_{1}$.