Spin splitting in graphene studied by means of tilted magnetic-field experiments

TL;DR

This study investigates spin splitting in single-layer and bilayer graphene using tilted magnetic field experiments, revealing an enhanced effective g-factor of approximately 2.7 through analysis of Shubnikov de Haas oscillations.

Contribution

The paper introduces a method to measure the effective g-factor in graphene by analyzing the spin-induced amplitude decrease of Shubnikov de Haas oscillations under tilted magnetic fields.

Findings

Effective g-factor g* ≈ 2.7 in both graphene systems

Method based on Lifshitz-Kosevich formula applied to tilted field data

Direct determination of g* as a function of charge carrier concentration

Abstract

We have measured the spin splitting in single-layer and bilayer graphene by means of tilted magnetic field experiments. Applying the Lifshitz-Kosevich formula for the spin-induced decrease of the Shubnikov de Haas amplitudes with increasing tilt angle we directly determine the product between the carrier cyclotron mass m* and the effective g-factor g* as a function of the charge carrier concentration. Using the cyclotron mass for a single-layer and a bilayer graphene we find an enhanced g-factor g* = 2.7 \pm 0.2 for both systems.