Layered Topological Antiferromagnetic Metal at Room Temperature -- YbMnGe
arXiv:2503.07206 · doi:10.1103/34g5-q2g6
Abstract
Metallic antiferromagnets are essential for efficient spintronic applications due to their fast switching and high mobility, yet room-temperature metallic antiferromagnets are rare. Here, we investigate YbMnGe, a room temperature antiferromagnet, and establish it as an exfoliable layered metal with altermagnetic surface states. Using multi-orbital Hubbard model calculations, we reveal that its robust metallic AFM ordering is stabilized by electronic correlations and a partially nested Fermi surface. Furthermore, we show that YbMnGe hosts symmetry-protected topological Dirac crossings, connecting unique even-order spin-polarized surface states with parabolic and inverted Mexican-hat-like dispersion. Our findings position YbMnGe as a promising platform for exploring the interplay of correlation, topology, and surface altermagnetism of layered antiferromagnets.
11 pages and 4 figures; To appear in Phys. Rev. B
References in corpus (24)
- Quantum ESPRESSO: a modular and open-source software project for quantum simulations of materials
- Topological Insulators with Inversion Symmetry
- A minimal two-band model for the superconducting Fe-pnictides
- Layered Antiferromagnetism Induces Large Negative Magnetoresistance in the van der Waals Semiconductor CrSBr
- Electric control of Dirac quasiparticles by spin-orbit torque in an antiferromagnet
- The bulk van der Waals layered magnet CrSBr is a quasi-1D material
- Critical behavior of quasi-two-dimensional semiconducting ferromagnet CrGeTe
- Electronic, magnetic and optical properties of MnPX (X = S, Se) monolayers with and without chalcogen defects: A first-principle study
- Perspective on Metallic Antiferromagnets
- WannSymm: A symmetry analysis code for Wannier orbitals
- Competition between antiferromagnetism and superconductivity, electron-hole doping asymmetry and "Fermi Surface" topology in cuprates
- Probing quasi-long-range ordering by magnetostriction in monolayer CoPS3
- Itinerant ferromagnetism mediated by giant spin polarization of metallic ligand band in van der Waals magnet Fe5GeTe2
- Testing the Monte Carlo - Mean Field approximation in the one-band Hubbard model
- Gapless quantum spin liquid in the triangular system SrCuSbO
- Electric double-layer transistor using layered iron selenide Mott insulator TlFe1.6Se2
- Two-dimensional Massless Dirac Fermions in Antiferromagnetic AFe2As2 (A = Ba, Sr)
- Fermi arcs and pseudogap phase in a minimal microscopic model of -wave superconductivity
- Observation of highly anisotropic bulk dispersion and spin-polarized topological surface states in CoTe2
- Structural, thermodynamic, and local probe investigations of a honeycomb material AgLiMnO
- Raman and first-principles study of the pressure induced Mott-insulator to metal transition in bulk FePS
- Competing charge density wave and antiferromagnetism of metallic atom wires in GaN(100) and ZnO(100)
- Emergent Half Metal at Finite Temperatures in a Mott Insulator
- Survival of magnetic correlations above ordering temperature in a ferromagnetically ordered classical kagomé magnet: Li9Cr3(P2O7)3(PO4)2