Quantum oscillations and nonsaturating magnetoresistivity in nodal-line semimetals

TL;DR

This paper investigates the magnetotransport properties of the nodal-line semimetal EuGa4, revealing characteristic quantum oscillations linked to its torus Fermi surface and analyzing the behavior of nonsaturating magnetoresistivity.

Contribution

It provides a theoretical analysis of quantum oscillations and magnetoresistivity in EuGa4, highlighting the role of the torus Fermi surface as an experimental signature of nodal-line semimetals.

Findings

Two distinct oscillation frequencies due to torus Fermi surface.

Nonsaturating magnetoresistivity observed at low energies.

Calculated MR ratio smaller than experimental reports.

Abstract

Understanding the magnetotransport behaviors in topological systems remains alluring, as a lot of intrinsic information could be extracted, e.g., the band structures, Berry phase, Fermi surface, carrier density, and so on. Motivated by the recent magnetotransport developments in nodal-line semimetal, EuGa4, in this paper, we will study the magnetotransport properties of the system, focusing on the quantum oscillations and nonsaturating magnetoresistivity (MR). Firstly, we analyze the chemical potential and magnetoconductivity oscillations with the magnetic field and reveal that there exist two distinct oscillation frequencies, which are caused by the characteristic torus Fermi surface and can be regarded as an important experimental signature of nodal-line semimetals. Then we calculate the MR and find that although the MR is nonsaturating with the magnetic field in the low-energy region, the MR ratio is much smaller than that reported in the experiment.