Dynamic paramagnon-polarons in altermagnets

Steward, Charles R. W.; Fernandes, Rafael M.; Schmalian, Jörg

doi:10.1103/physrevb.108.144418

Phys. Rev. B

2023

DOI: 10.1103/physrevb.108.144418

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Dynamic paramagnon-polarons in altermagnets

Charles R. W. Steward,

Rafael M. Fernandes,

Jörg Schmalian

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2024

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Cited by 9 publications

References 67 publications

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Symmetry invariants and classes of quasiparticles in magnetically ordered systems having weak spin-orbit coupling

Yang,

Liu,

Fang

2024

Nat Commun

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Symmetry invariants of a group specify the classes of quasiparticles, namely the classes of projective irreducible co-representations in systems having that symmetry. More symmetry invariants exist in discrete point groups than the full rotation group O(3), leading to new quasiparticles restricted to lattices that do not have any counterpart in a vacuum. We focus on the fermionic quasiparticle excitations under “spin-space group” symmetries, applicable to materials where long-range magnetic order and itinerant electrons coexist. We provide a list of 218 classes of new quasiparticles that can only be realized in the spin-space groups. These quasiparticles have at least one of the following properties that are qualitatively distinct from those discovered in magnetic space group(MSG)s, and distinct from each other:(i) degree of degeneracy,(ii) dispersion as function of momentum, and(iii) rules of coupling to external probe fields. We rigorously prove this result as a theorem that directly relates these properties to the symmetry invariants, and then illustrate this theorem with a concrete example, by comparing three 12-fold fermions having different sets of symmetry invariants including one discovered in MSG. Our approach can be generalized to realize more quasiparticles whose little co-groups are beyond those considered in our work.

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Symmetry invariants and classes of quasiparticles in magnetically ordered systems having weak spin-orbit coupling

Yang,

Liu,

Fang

2024

Nat Commun

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Review on spin-split antiferromagnetic spintronics

Yan,

Zhou,

Qin

et al. 2024

Applied Physics Letters

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Spin splitting plays a pivotal role in most modern spintronic effects. Conventionally, spin splitting accompanied by macroscopic magnetic moments has been typically discussed in the context of ferromagnets. Nevertheless, the amalgamation of spin splitting and antiferromagnets has led to a range of intriguing magnetoelectronic effects in the field of antiferromagnetic spintronics. Considering this perspective, this Letter focuses on exploring the emerging area of spin-split antiferromagnetic spintronics. It begins with a brief overview of the historical development of the anomalous Hall effect. Subsequently, recent studies on the spin-splitting-related anomalous Hall effects in antiferromagnets are elaborated upon. Finally, a summary is provided outlining the occurrence of spin splitting in different types of antiferromagnets, including noncollinear antiferromagnets and collinear altermagnets. Additionally, the associated magnetoelectronic effects are discussed.

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Topological transition from nodal to nodeless Zeeman splitting in altermagnets

Fernandes,

de Carvalho,

Birol

et al. 2024

Phys. Rev. B

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Dynamic paramagnon-polarons in altermagnets

Cited by 9 publications

References 67 publications

Symmetry invariants and classes of quasiparticles in magnetically ordered systems having weak spin-orbit coupling

Symmetry invariants and classes of quasiparticles in magnetically ordered systems having weak spin-orbit coupling

Review on spin-split antiferromagnetic spintronics

Topological transition from nodal to nodeless Zeeman splitting in altermagnets

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