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arXiv · 2412.02324

Anomalous Hall and Nernst effect switching via staggered rotation in a kagome antiferromagnetic semimetal

Subhadip Pradhan·Kartik Samanta·Ashis K. Nandy
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Abstract

The intricate interplay between magnetism and the topology of electronic structures provides a rich avenue for tailoring materials with unique and potent anomalous transport properties. In this paper, we present a strategy for inducing robust Berry curvature and anomalous transverse conductivity in noncollinear antiferromagnets through an unconventional approach termed ``small \textit{staggered rotation} of spin". Considering noncollinear Mn$_3$Sn, we demonstrate that the positive vector chirality antiferromagnetic configuration, typically associated with a vanishing anomalous Hall effect and Nernst effect, can be manipulated to exhibit finite anomalous Hall conductivity (AHC) and anomalous Nernst conductivity (ANC) through \textit{staggered rotation}. Furthermore, we illustrate that the value and sign of both the AHC and ANC can be tuned through \textit{staggered rotation}. This tuning is intricately influenced by the spin-orbit coupling (SOC) induced gapped nodal line, revealing the critical role of electronic structure modifications in achieving precise control over transport properties.

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Subhadip Pradhan, Kartik Samanta, Ashis K. Nandy. 2024-12-03. Anomalous Hall and Nernst effect switching via staggered rotation in a kagome antiferromagnetic semimetal. https://arxiv.org/abs/2412.02324

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