Circularly polarized light induces even-wave spin splittings in nonmagnetic centrosymmetric systems with SOC, producing s-, d-, and g-wave patterns like those in ferromagnets and enabling Chern insulator phases.
Odd-Parity Altermagnetism Originated from Orbital Orders
8 Pith papers cite this work. Polarity classification is still indexing.
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abstract
Odd-parity spin-splitting plays a central role in spintronics and unconventional superconductivity, yet its microscopic realization in collinear magnetic systems remains elusive. We propose a general symmetry-based strategy for realizing odd-parity altermagnetism by stacking two noncentrosymmetric monolayers in an interlayer antiferromagnetic configuration and applying an in-plane layer-flip operation. In this setting, odd-parity spin-splitting originates from nonrelativistic orbital orders rather than spin-orbit coupling, and is protected by an effective time-reversal symmetry despite the explicit time-reversal symmetry being broken. By exploiting lattice symmetries, our framework enables the realization of both $p$- and $f$-wave altermagnets. The resulting models generically host quantum spin Hall insulator phases, featuring topologically protected helical edge states and quantized spin Hall conductance. Our work expands the landscape of altermagnetic phases and opens a pathway toward spintronics and unconventional superconductivity in altermagnetic systems.
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Odd-parity magnon splitting is classified in 2D collinear antiferromagnets and induced by circularly polarized light or loop currents, driving topological transitions with chiral edge modes in bilayers.
Collinear spin-orbital magnets host mixed-parity altermagnetism as an intermediate regime between even- and odd-parity forms, inducible by circularly polarized light in a two-sublattice two-orbital model.
Elliptically polarized light irradiation converts d-wave altermagnets into Chern insulators, yielding quantized thermal Hall conductivity and gap-edge peaks in the thermoelectric Hall response.
D-wave altermagnets on Bi2Se3 surfaces induce a layer Hall effect with zero net Hall conductance for antiparallel Néel vectors and a quantized Chern state for parallel vectors.
Extended s-wave altermagnets are introduced as fully gapped spin-compensated states with isotropic spin splitting arising from valley-exchange symmetries, shown via effective two-valley and microscopic models with guiding principles for identification.
P-wave orbital magnetism protected by combined translation and time-reversal symmetry is proposed to originate from loop-current-induced orbital textures in a 2D Dirac lattice model, measurable via orbital Hall conductivity.
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Extended s-wave altermagnets
Extended s-wave altermagnets are introduced as fully gapped spin-compensated states with isotropic spin splitting arising from valley-exchange symmetries, shown via effective two-valley and microscopic models with guiding principles for identification.