Magneto-transmission as a probe of Dirac fermions in bulk graphite

TL;DR

This study uses far infrared magneto-transmission spectroscopy to identify Dirac fermions in bulk graphite, revealing their characteristic absorption lines and estimating key electronic parameters.

Contribution

It demonstrates that magneto-transmission spectroscopy can effectively probe Dirac fermions in bulk graphite, providing new insights into their electronic properties.

Findings

Identification of Dirac fermions via  scaling absorption lines

Fermi velocity estimated at 1.02x10^6 m/s

Pseudogap at H point below 10 meV

Abstract

Far infrared magneto-transmission spectroscopy has been used to probe "relativistic" fermions in highly oriented pyrolytic and natural graphite. Nearly identical transmission spectra of those two materials are obtained, giving the signature of Dirac fermions via absorption lines with an energy that scales as \sqrt{B}. The Fermi velocity is evaluated to be c*=1.02x10^6 m/s and the pseudogap at the H point is estimated to be below 10 meV.