Proximity to an antiferromagnet induces a phase-modulated superconducting order parameter with atomic-scale loop currents in Ising superconductors that have at least three magnetic sublattices and finite spin-orbit coupling.
Orbital Altermagnetism in Two Dimensions
4 Pith papers cite this work. Polarity classification is still indexing.
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abstract
We introduce the concept of \emph{orbital altermagnetism}, a symmetry-protected magnetic order of pure orbital degrees of freedom. It is characterized with ordered anti-parallel orbital magnetic moments in real space but momentum-dependent orbital band splittings, analogous to spin altermagnetism. Using a minimal tight-binding model with complex hoppings in a square-kagome lattice, we show that such order inherently arises from staggered loop currents, producing a $d$-wave-like orbital-momentum locking. First-principles calculations show that orbital altermagnetism emerges independent of spin ordering in in-plane ferromagnets of CuBr$_2$ and VS$_2$, so that it can be unambiguously identified experimentally. On the other hand, it may also coexist with spin altermagnetism, such as in monolayer MoO and CrO. The orbital altermagnetism offers an alternative platform for symmetry-driven magnetotransport and orbital-based spintronics, as exemplified by large nonlinear current-induced orbital magnetization.
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Dirac quadrupole altermagnets in 2D exhibit a topological orbital piezomagnetic effect from strain altering their quadrupole Dirac points.
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.
A repulsive Hubbard term selects topologically nontrivial pairing over the trivial one in singular-interaction superconductors, with the transition passing through a topology-induced time-reversal symmetry breaking phase.
citing papers explorer
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Proximity-induced orbital antiferromagnetism in Ising superconductors
Proximity to an antiferromagnet induces a phase-modulated superconducting order parameter with atomic-scale loop currents in Ising superconductors that have at least three magnetic sublattices and finite spin-orbit coupling.
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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.
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$P$-wave Orbital Magnetism
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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Topologically non-trivial gap function and topology-induced time-reversal symmetry breaking in a superconductor with singular dynamical interaction
A repulsive Hubbard term selects topologically nontrivial pairing over the trivial one in singular-interaction superconductors, with the transition passing through a topology-induced time-reversal symmetry breaking phase.