Comprehensive investigation of Quantum Oscillations in Semimetal Using an ac Composite Magnetoelectric Technique with Ultrahigh Sensitivity

TL;DR

This study introduces an ultrahigh-sensitivity ac composite magnetoelectric technique to comprehensively detect quantum oscillations in a topological semimetal, revealing all fundamental frequencies and magnetic breakdown phenomena with high precision.

Contribution

The paper demonstrates the effectiveness of the ac composite magnetoelectric method in capturing complete quantum oscillation spectra in complex topological semimetals, surpassing traditional techniques.

Findings

All fundamental QO frequencies of ZrSiS were detected.

Magnetic breakdown frequencies around 8000 T were observed at low fields.

The ME technique outperforms conventional methods in sensitivity and completeness.

Abstract

Quantum oscillation (QO), a physical phenomenon that reflects the characteristics of the Fermi surface and transport fermions, has been extensively observed in metals and semimetals through various approaches, like magnetostriction, magnetization, resistivity, and thermoelectric power. However, only some allowed oscillation frequencies can be revealed by each individual method, particularly in semimetals with intricate Fermi pockets and associated magnetic breakdown phenomena. In this paper, we present the application of an ac composite magnetoelectric (ME) technique to measure the QOs of a topological nodal-line semimetal, ZrSiS, which possesses six fundamental QO frequencies. By employing the ME technique with a maximum magnetic field of 13 T and a minimum temperature of 2 K, we are able to capture all the fundamental frequencies and most of the permissible magnetic breakdown frequencies. In comparison, some of the frequencies were missing in the aforementioned four methods under identical measurement conditions. Remarkably, a series of magnetic breakdown frequencies around 8000 T were revealed even in a magnetic field as low as 7.5 T. These findings highlight the ME technique as an ultrahigh-sensitive tool for studying Dirac Fermions and other topological semimetals with complex Fermi surfaces.