Linear magnetoresistance from Dirac-like fermions in graphite

TL;DR

This paper demonstrates that Bernal-stacked graphite exhibits linear magnetoresistance in weak magnetic fields due to Dirac-like carriers near specific Brillouin zone points, with unique Hall resistivity behavior.

Contribution

It reveals the origin of linear magnetoresistance in graphite as stemming from Dirac-like fermions near the H points, a novel insight into graphite's electronic properties.

Findings

Magnetoresistance scales linearly with magnetic field in weak fields.

Hall resistivity shows a non-analytic B ln|B| behavior.

Hole dominance in Hall response.

Abstract

We show that magnetoresistance of Bernal-stacked graphite (with the magnetic field ${\bf B}$ parallel to the c-axis and the current in the ab plane) scales linearly with the magnetic field over an interval of classically weak fields. The linearity is related to the presence of extremely light, Dirac-like carriers near the $H$ ($H^{\prime}$)- points of the Brillouin zone. The Hall resistivity in this interval also shows a non-analytic, $B\ln |B|$ behavior, and is dominated by holes.