Measurement of graphite tight-binding parameters using high field magneto-reflectance

TL;DR

This study uses high-field magneto-reflectance spectroscopy at 4K to measure and analyze the tight-binding parameters of graphite, revealing insights into electron-hole asymmetry and energy gaps in graphene systems.

Contribution

It introduces a new method to evaluate graphite's band parameters from magneto-reflectance data without complex lineshape analysis.

Findings

Determined several less-explored band parameters.

Observed Landau level transitions at high magnetic fields.

Analyzed magnetic field dispersion using a modified Slonczewski-Weiss-McClure model.

Abstract

frared reflectance spectroscopy at 4K in fields up to 31T. Both Schr\"odinger-like (K-point) and Dirac-like (H-point) Landau level transitions have been observed, and their magnetic field dispersion are analyzed by a newly-derived limiting case of the Slonczewski-Weiss-McClure model. The values of the band parameters are evaluated without using sophisticated conductivity peak lineshape analysis. In this work, several less-explored band parameters are determined from the experimental results and they are known to result in electron-hole asymmetry and the opening of an energy gap between the electron and hole bands in multilayer and bilayer graphene systems.