Ferromagnetic Weyl Fermions in Two-Dimensional Layered Electride Gd${}_2$C

Abstract

Recently, two-dimensional layered electrides have emerged as a new class of materials which possess anionic electron layers in the interstitial spaces between cationic layers. Here, based on first-principles calculations, we discover a time-reversal-symmetry-breaking Weyl semimetal phase in a unique two-dimensional layered ferromagnetic (FM) electride Gd${}_2$C. It is revealed that the crystal field mixes the interstitial electron states and Gd 5$d$ orbitals near the Fermi energy to form band inversions. Meanwhile, the FM order induces two spinful Weyl nodal lines (WNLs), which are converted into multiple pairs of Weyl nodes through spin-orbit coupling. Further, we not only identify Fermi-arc surface states connecting the Weyl nodes but also predict a large intrinsic anomalous Hall conductivity due to the Berry curvature produced by the gapped WNLs. Our findings demonstrate the existence of Weyl fermions in the room-temperature FM electride Gd${}_2$C, therefore offering a new platform to investigate the intriguing interplay between electride materials and magnetic Weyl physics.

References in corpus (33)

• Electric Field Effect in Atomically Thin Carbon Films
• The electronic properties of graphene
• 2D materials and van der Waals heterostructures
• Van der Waals Density Functional for General Geometries
• Electronic Structure of Pyrochlore Iridates: From Topological Dirac Metal to Mott Insulator
• Wannier90: A Tool for Obtaining Maximally-Localised Wannier Functions
• WannierTools: An open-source software package for novel topological materials
• Type-II Weyl Semimetals
• Topological quantum chemistry
• Chern semi-metal and Quantized Anomalous Hall Effect in HgCr2Se4
• Weyl semimetal phase in non-centrosymmetric transition metal monophosphides
• Giant anomalous Hall effect in a ferromagnetic Kagome-lattice semimetal
• Magnetic Weyl Semimetal Phase in a Kagome Crystal
• Symmetry-based Indicators of Band Topology in the 230 Space Groups
• Topological nodal line semimetals
• Fermi-arc diversity on surface terminations of the magnetic Weyl semimetal Co3Sn2S2
• Discovery of topological Weyl fermion lines and drumhead surface states in a room temperature magnet
• Negative flat band magnetism in a spin-orbit coupled correlated kagome magnet
• Fermi arcs and their topological character in the candidate type-II Weyl semimetal MoTe2
• Dirac node lines in pure alkali earth metals
• High-Throughput Identification of Electrides from all Known Inorganic Materials
• Emerging chiral edge states from the confinement of a magnetic Weyl semimetal in Co${}_3$Sn${}_2$S${}_2$
• Discovering Inorganic Electrides from an Automated Computational Screening
• Electrides as a New Platform of Topological Materials
• Ferromagnetic instability of interlayer floating electrons in quasi-two-dimensional electride Y${}_2$C
• Topological Nodal Line Electrides: Realization of Ideal Nodal Line State Nearly Immune from Spin-Orbit Coupling
• Helical Spin Order from Topological Dirac and Weyl Semimetals
• Voltage-driven magnetization switching and spin pumping in Weyl semimetals
• Computational Design of Flexible Electrides with Non-trivial Band Topology
• Unconventional temperature dependence of the anomalous Hall effect in HgCr2Se4
• Electronic correlation in the quasi-two-dimensional electride Y${}_2$C
• Hidden Weyl Fermions in Paramagnetic Electride Y${}_2$C
• Stacking-sequence-independent band structure and shear exfoliation of two-dimensional electride materials

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• Hydrogenation induced magnetic and electronic transitions in monolayer electride Gd${}_2$C: A first-principles study
• Magnetic surface on nonmagnetic bulk of electride Hf2S
• Large anomalous Hall effect induced by gapped nodal lines in GdZn and GdCd
• Topological Fermi-arc surface state covered by floating electrons on a two-dimensional electride
• Oxidation tuning of ferroic transitions in Gd${}_2$C monolayer
• First-Principles Design of Halide-Reduced Electrides: Magnetism and Topological Phases