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Altermagnetism in modified Lieb lattice Hubbard model
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abstract
We study the emergence of altermagnetism from repulsive interactions for electrons on the Lieb lattice as a model of quasi-2D oxychalcogenides with the so-called "anti-CuO$_{2}$" lattice structure. A comprehensive study of the Lieb lattice Hubbard model, using unrestricted Hartree-Fock and exact diagonalization techniques, establishes the presence of spin-${1\over 2}$ altermagnetic Mott insulating ground state for average electron densities of 2 and 4 per unit cell. Both phases show the characteristic spin splitting in the electron bands as well as in the magnon bands, as indicated by solutions of an effective spin-${1\over 2}$ Heisenberg model that we construct. We also provide evidence for altermagnetic metal formation in the electron- and hole-doped Mott state, giving rise to Fermi surfaces with $d_{x^{2}-y^{2}}$-wave spin splitting and quasi-one-dimensional characteristics.
Forward citations
Cited by 7 Pith papers
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Emergent altermagnetism at surfaces of antiferromagnets: full symmetry classification and material identification
Surface termination of collinear antiferromagnets can induce altermagnetic surface states, systematically classified here and identified in 140+ MAGNDATA materials.
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Interaction enhanced altermagnet in the Hatsugai-Kohmoto model
In the Hatsugai-Kohmoto altermagnet, interactions suppress double occupancy at a critical U_c and produce a log-divergent spin-flip peak at the lower gap edge.
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Orbital altermagnetism on the kagome lattice and possible application to $A$V$_3$Sb$_5$
On an odd-sublattice kagome lattice, non-uniform collinear orbital moments from CDW/loop-current order can form a d-wave altermagnet with spin-split bands, as possibly realized in AV3Sb5.
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Aging in a two-dimensional swarmalator crystal with delayed interactions
In a delayed 2D swarmalator crystal, aging anneals five-fold and seven-fold defects via merging and boundary escape, and a low-delay fluidized surface layer enables near-total defect elimination.
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A Comprehensive Study on A$_2$PdH$_2$: From Ambient to High Pressure
The abstract claims Tc up to 4.7 K in high-pressure Li2PdH2 and surveys the A2PdH2 family, but the manuscript body is a different paper on altermagnets, making the claimed results unverifiable in this submission.
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Correlated electrons in flat bands: Concepts and Developments
A review of the theoretical foundations and material realizations of correlated electrons in flat bands, with emphasis on Lieb and Kagome lattices and numerical methods.
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Symmetry, microscopy and spectroscopy signatures of altermagnetism
A review of the symmetry, microscopic origin, and detection of altermagnetism, a collinear magnetic phase with alternating spin polarization in momentum space.
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