Interlayer electronic transport in CaMnBi$_{2}$ antiferromagnet

TL;DR

This paper investigates interlayer electronic transport in CaMnBi$_{2}$, revealing Dirac fermions, coherent conduction, and magnetic field effects, contributing to understanding layered bismuth-based antiferromagnetic materials.

Contribution

It provides the first detailed study of interlayer transport and Dirac fermion behavior in CaMnBi$_{2}$, highlighting magnetic field effects in this class of materials.

Findings

Presence of Dirac fermions with nontrivial Berry's phase

Coherent electronic conduction evidenced by quantum oscillations

Magnetic field-induced changes in interlayer conduction

Abstract

We report interlayer electronic transport in CaMnBi$_{2}$ single crystals. Quantum oscillations and angular magnetoresistance suggest coherent electronic conduction and valley polarized conduction of Dirac states. Small cyclotron mass, large mobility of carriers and nontrivial Berry's phase are consistent with the presence of Dirac fermions on the side wall of the warped cylindrical Fermi surface. Similar to SrMnBi$_{2}$ that features an anisotropic Dirac cone, our results suggest that magnetic field-induced changes in the interlayer conduction are also present in layered bismuth-based materials with zero-energy line in momentum space created by the staggered alkaline earth atoms.