Effect of electronic band dispersion curvature on de Haas-van Alphen oscillations

TL;DR

This paper investigates how deviations from parabolic electronic band dispersion influence de Haas-van Alphen oscillations, revealing a temperature-dependent phase shift and frequency shift due to non-quadratic Landau band dispersion, especially in Dirac fermions.

Contribution

It demonstrates that non-quadratic band dispersion causes a field- and temperature-dependent phase shift and frequency shift in de Haas-van Alphen oscillations, extending understanding of oscillation spectra.

Findings

Oscillation amplitude remains unaffected by band curvature.

Non-quadratic dispersion induces a temperature-dependent Onsager phase shift.

Predicted a temperature-dependent frequency shift in oscillations.

Abstract

The effect of electronic band curvature, i.e. the deviation from parabolicity of electronic dispersion, on de Haas-van Alphen oscillations spectra is studied. Although the oscillations amplitude remain unaffected, it is demonstrated that non-quadratic terms of the Landau bands dispersion, which is particularly relevant in the case of Dirac fermions, induces a field- and temperature-dependent Onsager phase. As a result, a temperature-dependent shift of the de Haas-van Alphen oscillations frequency is predicted.