Surface altermagnetism with d-wave spin splitting occurs in centrosymmetric collinear antiferromagnets only when no sublattice-exchanging antiunitary symmetry survives at the surface, as shown by symmetry analysis and first-principles calculations on V3Al and BaMn2Sb2 versus MnPt.
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Dirac quadrupole altermagnets in 2D exhibit a topological orbital piezomagnetic effect from strain altering their quadrupole Dirac points.
Slave-rotor theory on the Lieb-lattice altermagnetic Hubbard model finds interaction-driven transitions from normal metal to altermagnetic metal to altermagnetic insulator to Mott insulator, with spin splitting suppressed in the final phase.
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$d$-wave Surface Altermagnetism in Centrosymmetric Collinear Antiferromagnets
Surface altermagnetism with d-wave spin splitting occurs in centrosymmetric collinear antiferromagnets only when no sublattice-exchanging antiunitary symmetry survives at the surface, as shown by symmetry analysis and first-principles calculations on V3Al and BaMn2Sb2 versus MnPt.
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Topological piezomagnetic effect in two-dimensional Dirac quadrupole altermagnets
Dirac quadrupole altermagnets in 2D exhibit a topological orbital piezomagnetic effect from strain altering their quadrupole Dirac points.
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Slave-rotor theory of correlated altermagnets on the Lieb lattice
Slave-rotor theory on the Lieb-lattice altermagnetic Hubbard model finds interaction-driven transitions from normal metal to altermagnetic metal to altermagnetic insulator to Mott insulator, with spin splitting suppressed in the final phase.