Spin Splitting in de Haas-van Alp-hen Oscillation in Two-Dimensional Two-Band Systems

TL;DR

This paper investigates how Zeeman effects influence de Haas-van Alphen oscillations in 2D two-band systems, revealing deviations from traditional models and observable angle-dependent anomalies in specific materials.

Contribution

It demonstrates that the Fourier amplitudes of dHvA oscillations in 2D two-band systems do not follow the standard spin reduction factor, highlighting a novel behavior not captured by existing Lifshitz-Kosevich theory.

Findings

Fourier amplitudes deviate from the spin reduction factor

Anomalous g-factor dependence observed in angle measurements

Potential experimental signatures in organic conductors and Sr2RuO4

Abstract

We study the effects of the Zeeman term on the de Haas van Alphen (dHvA) oscillation in two-dimensional two-band systems. We found that the Fourier transform amplitudes of the oscillations are not described by the spin reduction factor in the Lifshitz-Kosevich formalism in two-dimensional systems. The anomalous dependence on the effective $g$-factor can be observed by tilting-angle dependence of the dHvA oscillation in quasi-two-dimensional organic conductors and Sr$_2$RuO$_4$.