Macroscopic altermagnetic domains in MnTe were visualized as two distinct time-reversal symmetry breaking regions with large Kerr rotations independent of net magnetization, controllable by external stimuli.
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Magnetization, transport, and muon spin relaxation measurements provide evidence for altermagnetic order in Fe0.85Cr0.15Sb2 below ~3.5 K with time-reversal symmetry breaking but no net magnetization.
Altermagnets exhibit a resonant third-order intrinsic anomalous Hall effect from the Berry curvature quadrupole, serving as a quantum geometric transport fingerprint.
Coulomb interactions drive altermagnetism in the Kagome Hubbard model at Dirac filling, producing an insulating state with split magnons detectable by inelastic neutron scattering.
Optical driving induces Floquet spin splitting in antiferromagnets, enabling steady-state pure spin currents and thermal-bath-engineered nonrelativistic spin accumulation.
Finite-momentum superconducting states occur when odd-frequency Cooper pairing correlations in the uniform state reach large amplitudes, identified via poles of the pair fluctuation propagator in weak-coupling theory.
Ultra-clean RuO2 crystals exhibit weakly correlated 3D Fermi-liquid behavior with susceptibility increasing with temperature due to lattice-expansion effects on the band structure.
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Third-order intrinsic anomalous Hall effect as a transport fingerprint of altermagnets
Altermagnets exhibit a resonant third-order intrinsic anomalous Hall effect from the Berry curvature quadrupole, serving as a quantum geometric transport fingerprint.