Using the de Haas-van Alphen effect to map out the closed three-dimensional Fermi surface of natural graphite

TL;DR

This study uses de Haas-van Alphen measurements to map the three-dimensional Fermi surface of natural graphite, revealing elongated ellipsoids and suggesting a larger trigonal warping parameter than previously estimated.

Contribution

It provides the first detailed 3D mapping of graphite's Fermi surface using dHvA measurements and refines the understanding of its electronic structure.

Findings

Graphite has a 3D closed Fermi surface.

Fermi surface is described by elongated ellipsoids.

Trigonal warping parameter $\gamma_3$ is larger than previously thought.

Abstract

The Fermi surface of graphite has been mapped out using de Haas van Alphen (dHvA) measurements at low temperature with in-situ rotation. For tilt angles $\theta>60^{\circ}$ between the magnetic field and the c-axis, the majority electron and hole dHvA periods no longer follow the $\cos(\theta)$ behavior demonstrating that graphite has a 3 dimensional closed Fermi surface. The Fermi surface of graphite is accurately described by highly elongated ellipsoids. A comparison with the calculated Fermi surface suggests that the SWM trigonal warping parameter $\gamma_3$ is significantly larger than previously thought.