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Impact of strong electronic correlations on altermagnets: The case of NiS2

Ina Park1, Turan Birol2, Antoine Georges3,1,4,5, and Rafael M. Fernandes6,7

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Phys. Rev. Materials 10, 054415 – Published 20 May, 2026

DOI: https://doi.org/10.1103/pgp6-zlh8

Abstract

One of the distinguishing features of an altermagnet is that its spin-up and spin-down bands display a nodal momentum-dependent splitting even in the absence of spin-orbit coupling. While this property has been investigated in many weakly correlated altermagnetic materials, the impact of strong electron-electron interactions on the spin-dependent electronic structure has remained underexplored, particularly in metals. Here, we propose NiS2 as a prototypical strongly correlated metallic altermagnet. While at ambient pressure this compound is an altermagnetic Mott insulator, it undergoes a pressure-driven metal-insulator transition (MIT) while maintaining its altermagnetic ordered phase. By systematically comparing density functional theory (DFT), DFT+U, and DFT+DMFT (dynamical mean-field theory)  calculations on the metallic altermagnetic phase near the MIT, we disentangle how strong static and dynamic correlations modify the electronic structure. Specifically, the spin splitting of the bands is modified not only through the enhancement of the local magnetic moment caused by static correlations, but also by the momentum-dependent bandwidth renormalization caused by dynamic correlations. Moreover, dynamic electronic correlations cause a pronounced lifetime asymmetry between the spin-up and spin-down quasiparticles, an effect that is amplified by the particle-hole asymmetry promoted by Hund's correlations. Our results not only shed light on the rich landscape of correlation effects in metallic altermagnets, but they also establish NiS2 as a platform to investigate the interplay between Mott and Hund physics and altermagnetic order.

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Altermagnetic and Related Materials

Editors of Physical Review Materials are pleased to present the Collection on Altermagnetic and Related Materials, highlighting cutting-edge advances in theoretical and experimental identification of novel altermagnetic materials, their properties, and their potential applications. The Collection is being guest-edited by Kirill Belashchenko of the University of Nebraska-Lincoln (USA), Cheng Song of Tsinghua University (China), and Peter Wadley of The University of Nottingham (UK). Every article published in this collection underwent a rigorous peer review process, adhering to the same high standards applied to all papers. The Physical Review Materials editorial team managed the peer review and made all editorial decisions.

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Phys. Rev. Materials 10, 054415– Published 20 May, 2026
  • Received 18 December 2025
  • Revised 28 March 2026
  • Accepted 29 April 2026
Article part of CHORUS
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