Interlayer tunneling spectroscopy of graphite at high magnetic field oriented parallel to the layers

TL;DR

This study investigates interlayer tunneling in graphite under high magnetic fields, revealing a peak in the spectrum that shifts linearly with the field, explained by a model involving Dirac electron wave function delocalization.

Contribution

The paper introduces a theoretical model explaining the tunneling spectrum peak in graphite under high magnetic fields using Dirac electron dynamics.

Findings

Peak in tunneling spectrum at finite voltage V_0

V_0 increases linearly with magnetic field H

Resonant condition E=vH explains wave function delocalization

Abstract

Interlayer tunneling in graphite mesa-type structures is studied at a strong in-plane magnetic field $H$ up to 55 T and low temperature $T=1.4$ K. The tunneling spectrum $dI/dV$ vs. $V$ has a pronounced peak at a finite voltage $V_0$. The peak position $V_0$ increases linearly with $H$. To explain the experiment, we develop a theoretical model of graphite in the crossed electric $E$ and magnetic $H$ fields. When the fields satisfy the resonant condition $E=vH$, where $v$ is the velocity of the two-dimensional Dirac electrons in graphene, the wave functions delocalize and give rise to the peak in the tunneling spectrum observed in the experiment.