Crystalline antiunitary symmetry in altermagnets selects pairing that produces robust nodal topological superconducting phases with Majorana flat bands and chiral edge states.
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Static lattice distortions from adiabatic electron-phonon coupling act as a tuning knob that alters the magnitude, anisotropy, phase, and chirality of noncollinear RKKY couplings in Rashba d-wave altermagnets.
Slow phonons suppress the spin Edelstein effect in strained Rashba d-wave altermagnets through energy renormalization that collapses the Fermi surface, producing tunable anisotropic depolarization.
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.
A mixed singlet-triplet Ising state in a 2D p-wave magnet transitions to a nodal topological superconducting phase with Majorana edge modes protected by momentum-resolved winding numbers when triplet pairing exceeds singlet pairing.
2D spin-antiferroelectric altermagnets such as monolayer (CoCl)2Te are predicted to show giant spin splitting with spin currents switchable by in-plane electric field angle when hole-doped or gate polarity when electron-doped.
Monolayer CrCX3 and Janus Cr2C2S3Se3 compounds realize 2D higher-order topological insulator phases protected by C3 symmetry, hosting corner states with fractional charges even under spin-orbit coupling.