Altermagnets host a purely intrinsic orbital-splitter current that is strongly anisotropic, exceeds the spin-splitter current by up to a factor of four in some directions, and generates damping-like torque to speed up magnetization switching.
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Centrosymmetric altermagnets exhibit giant magnetic-field-induced spin magnetization of order 10^{-2} μ_B nm^{-3} at ~10 mT, controlled solely by the spin-rotation quantum metric as the only symmetry-allowed linear quantum-geometric response.
Altermagnets host a giant nonperturbative magnetic orbital Hall effect that generates collinear orbital currents capable of switching perpendicular magnetization without external fields.
In anisotropic disordered 2D metals, altermagnetism emerges at zero temperature for larger anisotropy and coupling strengths, competing with ferromagnetism at zero spin-orbit coupling and with a paramagnetic phase at finite spin-orbit coupling via a quantum critical point.
Altermagnetic sublattice order imposes momentum-dependent nodes in the superconducting gap for local pairing interactions and favors nonunitary equal-spin triplet superconductivity at large spin splitting.
Supercurrents in superconductor/altermagnet hybrids generate a tunable Néel torque that can propel domain walls and reverse Néel vector orientation.
Slave-boson calculations on the checkerboard Hubbard model show altermagnons crossing from chirality-selective dissipation to coherent but deformed chiral branches at the metal-insulator transition.
Magnetic instabilities in generic two-orbital systems are governed by the full interplay of the bare susceptibility tensor and spin interaction matrix, not solely by the quantum geometry of a single-channel susceptibility.
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Supercurrent-Driven N\'eel Torque in Superconductor/Altermagnet Hybrids
Supercurrents in superconductor/altermagnet hybrids generate a tunable Néel torque that can propel domain walls and reverse Néel vector orientation.