Third-order photoconductivities in d-wave altermagnets are determined solely by quantum metric and connection, with closed-form solutions when delta-bond hopping vanishes and perturbative solutions otherwise, verified numerically.
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Altermagnets intrinsically generate hundreds of high harmonics in spin and charge pumping under magnetic dynamics, with amplitudes exceeding light-driven schemes and without needing extra spin-orbit coupling.
Dirac quadrupole altermagnets in 2D exhibit a topological orbital piezomagnetic effect from strain altering their quadrupole Dirac points.
Sliding bilayer altermagnets host antiferromagnetic half-metallicity and Chern insulator phases via spin-dependent interlayer hopping in ferrovalley states, demonstrated in V2OSSe by first-principles calculations.
Geometry-driven electric field gradients in finite mesoscopic systems induce antisymmetric linear transverse magnetization forbidden by Onsager reciprocity without the gradient, plus ferroaxial moments, with linear electric-field scaling for the transverse component.
A honeycomb lattice of Aza-3-Triangulene and 2-Triangulene molecules is predicted to form a half-metallic ferrimagnet with fully spin-polarized flat-band conduction, zero net magnetization, and 50 meV exchange couplings for room-temperature stability.
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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.