Disorder- and Topology-Enhanced Fully Spin-Polarized Currents in Nodal Chain Spin-Gapless Semimetals

TL;DR

This paper investigates the unique spin-polarized transport properties of nodal chain spin-gapless semimetals, revealing intrinsic mechanisms and potential for strong anomalous and spin transport effects in magnetic topological semimetals.

Contribution

It demonstrates that the intrinsic anomalous and spin transport in these semimetals originate from gapped nodal chains, highlighting their potential for spintronic applications.

Findings

Intrinsic transport is dominated by gapped nodal chains.

Side-jump mechanism is negligible in these materials.

Skew-scattering enhances Hall and Nernst signals.

Abstract

Recently discovered high-quality nodal chain spin-gapless semimetals $M$F$_3$ ($M$ = Pd, Mn) feature an ultra-clean nodal chain in the spin up channel residing right at the Fermi level and displaying a large spin gap leading to a 100\% spin-polarization of transport properties. Here, we investigate both intrinsic and extrinsic contributions to anomalous and spin transport in this class of materials. The dominant intrinsic origin is found to originate entirely from the gapped nodal chains without the entanglement of any other trivial bands. The side-jump mechanism is predicted to be negligibly small, but intrinsic skew-scattering enhances the intrinsic Hall and Nernst signals significantly, leading to large values of respective conductivities. Our findings open a new material platform for exploring strong anomalous and spin transport properties in magnetic topological semimetals.