Recognition of Fermi-arc states through the magnetoresistance quantum oscillations in Dirac semimetal Cd3As2 nanoplates

TL;DR

This study identifies Fermi-arc states in Dirac semimetal Cd3As2 nanoplates through magnetoresistance quantum oscillations, revealing Weyl magnetic orbits and their unique 2D quantum oscillations at high magnetic fields.

Contribution

It demonstrates the detection of Fermi-arc states via quantum oscillations and nonlocal measurements in Dirac semimetal nanoplates, advancing understanding of Weyl magnetic orbits.

Findings

Emergence of 2D quantum oscillations at high magnetic fields

Superposition of 2D oscillations on 3D bulk background

Nonlocal detection confirms Weyl magnetic orbits

Abstract

The disjointed Fermi-arcs in Weyl semimetals can intertwine with chiral bulk modes and participate in unusual closed magnetic orbits in the presence of a vertical magnetic field. Here we carry out the quantum oscillation study of such unusual Weyl magnetic orbits in Dirac semimetal Cd3As2, a close cousin of Weyl semimetals. We find that extra two-dimensional (2D) quantum oscillations emerge at high field, which superimpose on 3D bulk background and can be attributed to the Weyl magnetic orbits, when the thickness of nanoplates is smaller than the mean free path of the electrons. Further evidence of the 2D quantum oscillations from the Weyl magnetic orbits is provided by the nonlocal detection, which demonstrates an alternative way to study the quantum transport properties of Fermi-arcs under magnetic field.