High magnetic field induced charge density waves and sign reversal of the Hall coefficient in graphite

TL;DR

This study investigates how very strong magnetic fields induce charge density waves and cause the Hall coefficient to change sign in highly oriented pyrolytic graphite, revealing the role of hole-like quasi-particles.

Contribution

It demonstrates the magnetic field-induced charge density wave transition and Hall sign reversal in graphite, highlighting the anisotropic dependence on the magnetic field orientation.

Findings

Hall coefficient changes from negative to positive at high magnetic fields

Charge density wave transition occurs at specific magnetic field strengths

Hall sign reversal depends on the magnetic field component along the c-axis

Abstract

We report on the investigation of magnetic field induced charge density wave and Hall coefficient sign reversal in a quasi-two dimensional electronic system of highly oriented pyrolytic graphite under very strong magnetic field. The change of Hall sign coefficient from negative to positive occurs at low temperature and high magnetic field just after the charge density wave transition, suggesting the role of hole-like quasi-particles in this effect. Angular dependent measurements show that the charge density wave transition and Hall sign reversal fields follow the magnetic field component along the c-axis of graphite.