Impact of strong electronic correlations on altermagnets: the case of NiS2
arXiv:2512.17059 · doi: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 little explored, 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 DFT, DFT+U, and DFT+DMFT 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 also establishes NiS2 as a platform to investigate the interplay between Mott and Hund physics and altermagnetic order.
17 pages, 8 figures
References in corpus (42)
- Quantum ESPRESSO: a modular and open-source software project for quantum simulations of materials
- Altermagnetism: spin-momentum locked phase protected by non-relativistic symmetries
- Strong electronic correlations from Hund's coupling
- Broken Kramers' degeneracy in altermagnetic MnTe
- Altermagnetism: Exploring New Frontiers in Magnetism and Spintronics
- Direct observation of altermagnetic band splitting in CrSb thin films
- Prediction of unconventional magnetism in doped FeSb2
- Observation of Giant Band Splitting in Altermagnetic MnTe
- Large band-splitting in -wave type altermagnet CrSb
- Discovery of a metallic room-temperature d-wave altermagnet KV2Se2O
- Antiferroelectric Altermagnets: Antiferroelectricity Alters Magnets
- Ferroelectric switchable altermagnetism
- Three-dimensional mapping of the altermagnetic spin splitting in CrSb
- Magnetic octupoles as the order parameter for unconventional antiferromagnetism
- Crystal-symmetry-paired spin-valley locking in a layered room-temperature antiferromagnet
- Spin-split collinear antiferromagnets: a large-scale ab-initio study
- Topological transition from nodal to nodeless Zeeman splitting in altermagnets
- Quantum geometry induced nonlinear transport in altermagnets
- Minimal Models for Altermagnetism
- Two-dimensional altermagnets from high throughput computational screening: symmetry requirements, chiral magnons and spin-orbit effects
- Mirror Chern Bands and Weyl Nodal Loops in Altermagnets
- AI-accelerated Discovery of Altermagnetic Materials
- Topological Weyl Altermagnetism in CrSb
- Intrinsic anomalous Hall effect in altermagnets
- Observation of surface Fermi arcs in altermagnetic Weyl semimetal CrSb
- Altermagnetism from interaction-driven itinerant magnetism
- Altermagnetism on the Shastry-Sutherland lattice
- The Hund-metal path to strong electronic correlations
- Altermagnetic phase transition in a Lieb metal
- Ruddlesden-Popper and perovskite phases as a material platform for altermagnetism
- Differentiating Hund from Mott physics in a three-band Hubbard-Hund model: Temperature dependence of spectral, transport, and thermodynamic properties
- Importance of ligand on-site interactions for the description of Mott-insulators in DFT+DMFT
- Explicit demonstration of the equivalence between DFT+U and the Hartree-Fock limit of DFT+DMFT
- Collinear Altermagnets and their Landau Theories
- Magneto-optical spectra of an organic antiferromagnet as a candidate for an altermagnet
- Fractionalized Altermagnets: from neighboring and altermagnetic spin-liquids to spin-symmetric band splitting
- Spin-orbit enabled unconventional Stoner magnetism
- Truncated mass divergence in a Mott metal
- Low-energy perspective on two-orbital Hund metals and the case of LaNiO2
- Gating-Induced Mott Transition in NiS
- Microscopic origin of the magnetic interactions and their experimental signatures in altermagnetic LaOMnSe
- Clean realization of the Hund physics near the Mott transition: under pressure