Topological Nodal Chains and Transverse Transports in Ferromagnetic Centrosymmetric Semimetal FeIn2S4

TL;DR

This paper predicts that ferromagnetic FeIn2S4 hosts topological nodal chains protected by nonsymmorphic symmetries, leading to unique surface states and significant anomalous transport properties, offering a new platform for topological magnetic materials.

Contribution

It introduces ferromagnetic FeIn2S4 as a theoretical candidate for nodal chain semimetals with robust topological features and anomalous transport effects.

Findings

FeIn2S4 exhibits hourglass-type band crossings forming nodal chains.

Nodal chains are protected by nonsymmorphic glide mirror symmetries.

The material shows large anomalous Hall and Nernst conductivities.

Abstract

Nodal chain semimetals protected by nonsymmorphic symmetries are distinct from Dirac and Weyl semimetals, featuring unconventional topological surface states and resulting in anomalous magnetotransport properties. Here, we reveal that the ferromagnetic FeIn2S4 is a suitable nodal chain candidate in theory. Centrosymmetric FeIn2S4 with nonsymmorphic symmetries shows half-metallicity and clean band-crossings with hourglass-type dispersion tracing out nodal lines. Owing to glide mirror symmetries, the nontrivial nodal loops form nodal chain, which is associated with the perpendicular glide mirror planes. These nodal chains are robust against spin-orbital interaction, giving rise to the coexistence of drumhead-type surface states and closed surface Fermi arcs. Moreover, the nodal loops protected by nonsymmorphic symmetry contribute to large anomalous Hall conductivity and the anomalous Nernst conductivity. Our results provide a platform to explore the intriguing topological state and transverse transport properties in magnetic system.