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Discovery of a metallic room-temperature d-wave altermagnet KV2Se2O
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Beyond conventional ferromagnetism and antiferromagnetism, altermagnetism is a recently discovered unconventional magnetic phase characterized by time-reversal symmetry breaking and spin-split band structures in materials with zero net magnetization. This distinct magnetic phase not only enriches the understanding of fundamental physical concepts but also has profound impacts on condense-matter physics research and practical device applications. Spin-polarized band structures have been recently observed in semiconductors MnTe and MnTe2 with vanishing net magnetization, confirming the existence of this unconventional magnetic order. Metallic altermagnets have unique advantages for exploring novel physical phenomena related to low-energy quasiparticle excitations and for applications in spintronics as electrical conductivity in metals allows the direct manipulation of spin current through electric field. Here, through comprehensive characterization and analysis of the magnetic and electronic structures of KV2Se2O, we have unambiguously demonstrated a metallic room-temperature altermaget with d-wave spin-momentum locking. The highly anisotropic spin-polarized Fermi surfaces and the spin-density-wave order emerging in the altermagnetic phase make it an extraordinary platform for designing high-performance spintronic devices and studying many-body effects coupled with the unconventional magnetism.
Forward citations
Cited by 8 Pith papers
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Quantum geometry and magnon Hall transport in an altermagnet
Magnon thermal Hall and spin Nernst conductivities in a Lieb lattice altermagnet scale with the altermagnetic splitting, computable from a new closed-form symplectic quantum geometric tensor.
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Elasto-Hall conductivity and the anomalous Hall effect in altermagnets
Strain distorts the Berry curvature quadrupole of an altermagnet into a net monopole, producing an anomalous Hall effect linear in the electric field.
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Coulomb Drag in Altermagnets
Coulomb drag in altermagnetic bilayers is predicted to produce Hall drag and spin Hall drag without spin-orbit coupling, with orientation-dependent signatures of altermagnetism.
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Symmetry-Breaking Magneto-Optical Effects in Altermagnets
Uniaxial strain selectively breaks the symmetries that hide altermagnetism, producing detectable optical absorption and Kerr rotation that ordinary antiferromagnets do not show.
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Electrical switching of altermagnetism
A MnTe bilayer with broken parity symmetry can be deterministically switched by a pure electric current, according to symmetry analysis, first-principles spin accumulation calculations, and LLG simulations.
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Altermagnetism in modified Lieb lattice Hubbard model
Unbiased Hartree-Fock and exact diagonalization find altermagnetic Mott insulating and metallic phases in the Lieb lattice Hubbard model with interactions only on the transition-metal sublattices.
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Enhancement of d-wave Pairing in Strongly Correlated Altermagnet
Spin-dependent hopping anisotropy weakens antiferromagnetism and enhances d-wave pairing correlations in a strongly correlated altermagnetic Hubbard model.
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Recent progress on electron- and magnon-mediated torques
A review of electron- and magnon-mediated torques, covering spin-orbit, orbital, and magnon torque mechanisms and materials.
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