Dirac Fermions in Antiferromagnetic FeSn Kagome Lattices with Combined Space Inversion and Time Reversal Symmetry

Abstract

Symmetry principles play a critical role in formulating the fundamental laws of nature, with a large number of symmetry-protected topological states identified in recent studies of quantum materials. As compelling examples, massless Dirac fermions are jointly protected by the space inversion symmetry $P$ and time reversal symmetry $T$ supplemented by additional crystalline symmetry, while evolving into Weyl fermions when either $P$ or $T$ is broken. Here, based on first-principles calculations, we reveal that massless Dirac fermions are present in a layered FeSn crystal containing antiferromagnetically coupled ferromagnetic Fe kagome layers, where each of the $P$ and $T$ symmetries is individually broken but the combined $PT$ symmetry is preserved. These stable Dirac fermions protected by the combined $PT$ symmetry with additional non-symmorphic $S_{2z}$ symmetry can be transformed to either massless/massive Weyl or massive Dirac fermions by breaking the $PT$ or $S_{2z}$ symmetry. Our angle-resolved photoemission spectroscopy experiments indeed observed the Dirac states in the bulk and two-dimensional Weyl-like states at the surface. The present study substantially enriches our fundamental understanding of the intricate connections between symmetries and topologies of matter, especially with the spin degree of freedom playing a vital role.

arXiv comment6 pages, 4 figures

References in corpus (33)

• Electronic Structure of Pyrochlore Iridates: From Topological Dirac Metal to Mott Insulator
• Weyl and Dirac Semimetals in Three Dimensional Solids
• Wannier90: A Tool for Obtaining Maximally-Localised Wannier Functions
• WannierTools: An open-source software package for novel topological materials
• Discovery of a Three-dimensional Topological Dirac Semimetal, Na3Bi
• Dirac semimetal and topological phase transitions in A3Bi (A=Na, K, Rb)
• Three Dimensional Dirac Semimetal and Quantum Transports in Cd3As2
• Observation of a topological 3D Dirac semimetal phase in high-mobility Cd3As2
• Giant anomalous Hall effect in a ferromagnetic Kagome-lattice semimetal
• Symmetry protected topological orders and the group cohomology of their symmetry group
• Experimental Realization of a Three-Dimensional Dirac Semimetal
• Prediction and observation of the first antiferromagnetic topological insulator
• Massive Dirac fermions in a ferromagnetic kagome metal
• Classification of stable three-dimensional Dirac semimetals with nontrivial topology
• Dirac fermions and flat bands in the ideal kagome metal FeSn
• Evidence for Magnetic Weyl Fermions in a Correlated Metal
• Gapless surface Dirac cone in antiferromagnetic topological insulator MnBi${}_2$Te${}_4$
• Topological Electronic Structure and Its Temperature Evolution in Antiferromagnetic Topological Insulator MnBi2Te4
• Dirac surface states in intrinsic magnetic topological insulators EuSn2As2 and MnBi2nTe3n+1
• Discovery of Dirac Node Arcs in PtSn4
• Dirac Fermions in Antiferromagnetic Semimetal
• Photoelectron spin-flipping and texture manipulation in a topological insulator
• Electric control of Dirac quasiparticles by spin-orbit torque in an antiferromagnet
• Two-dimensional Weyl Half Semimetal and Tunable Quantum Anomalous Hall Effect in Monolayer PtCl${}_3$
• Topological Classification of Crystalline Insulators with Point Group Symmetry
• Illuminating the dark corridor in graphene: polarization dependence of angle-resolved photoemission spectroscopy on graphene
• Topological semimetals protected by off-centered symmetries in nonsymmorphic crystals
• Observation of topological nodal-line fermionic phase in GdSbTe
• Quasi 2-D magnetism in the Kagome layer compound FeSn
• Orbital-Selective Spin Texture and its Manipulation in a Topological Insulator
• Topological charges of three-dimensional Dirac semimetals with rotation symmetry
• Rotational strain in Weyl semimetals: A continuum approach
• Hourglass Weyl loops in two dimensions: Theory and material realization in monolayer GaTeI family

Cited by in corpus (48)

• Cascade of correlated electron states in a kagome superconductor CsV3Sb5
• Topological kagome magnets and superconductors
• Rotation symmetry breaking in the normal state of a kagome superconductor KV3Sb5
• Low-frequency divergence and quantum geometry of the bulk photovoltaic effect in topological semimetals
• Orbital-selective Dirac fermions and extremely flat bands in frustrated kagome-lattice metal CoSn
• Fantastic flat bands and where to find them: The CoSn-type compounds
• Realizing Kagome Band Structure in Two-Dimensional Kagome Surface States of $R{V}_{6}S{n}_6$ ($R$=Gd,Ho)
• Charge-density-wave-induced bands renormalization and energy gaps in a kagome superconductor RbV3Sb5
• Spectroscopic evidence of flat bands in breathing kagome semiconductor Nb3I8
• Damped Dirac magnon in a metallic kagome antiferromagnet FeSn
• Nanoscale visualization and spectral fingerprints of the charge order in ScV6Sn6 distinct from other kagome metals
• Protracted Kondo screening and kagome bands in heavy-fermion metal Ce${}_3$Al
• Intrinsic Magnetic Topological Materials
• Tunable magnetism and electron correlation in Titanium-based Kagome metals RETi3Bi4 (RE = Yb, Pr, and Nd) by rare-earth engineering
• Observation of flat and weakly dispersing bands in a van der Waals semiconductor Nb3Br8 with breathing kagome lattice
• Second-order topological corner states in zigzag graphene nanoflake with different types of edge magnetic configurations
• Kagome Flatbands for Coherent Exciton-Polariton Lasing
• Spin-polarized imaging of the antiferromagnetic structure and field-tunable bound states in kagome magnet FeSn
• Colossal orbital Zeeman effect driven by tunable spin-Berry curvature in a kagome metal
• How correlations change the magnetic structure factor of the kagome Hubbard model
• Giant periodic pseudo-magnetic fields in strained kagome magnet FeSn epitaxial films on SrTiO${}_3$(111) substrate
• Evolution of Magnetism in Magnetic Topological Semimetal NdSb${}_x$Te${}_{2-x+\delta }$
• Engineering topologically protected zero-dimensional interface end states in antiferromagnetic heterojunction graphene nanoflakes
• Spin Excitations and Flat Electronic Bands in a Cr-based Kagome Superconductor
• \textit{Ab initio} study on spin fluctuations of itinerant kagome magnet FeSn
• Kagome metals
• Persistent flat band splitting and strong selective band renormalization in a kagome magnet thin film
• Topological Electronic Structure Evolution with Symmetry Breaking Spin Reorientation in (Fe${}_{1-x}$Co${}_x$)Sn
• Interlayer Exchange Interaction Driven Topological Phase Transition in Antiferromagnetic Electride Gd${}_2$O
• Electronic band structures of topological kagome materials
• Unusual surface states associated with the PT-symmetry breaking and antiferromagnetic band folding in NdSb
• Temperature dependence of correlated electronic states in archetypal kagome metal CoSn
• Orbital-selective effect of spin reorientation on the Dirac fermions in a non-charge-ordered kagome ferromagnet Fe${}_3$Ge
• Electron correlations and $T$-breaking density wave order in a ${\mathbb{Z}}_2$ kagome metal
• Phononic drumhead surface state in distorted kagome compound RhPb
• A density-wave-like transition in the polycrystalline V3Sb2 sample with bilayer kagome lattice
• Kagome surface states and weak electronic correlation in vanadium-kagome metals
• Spin excitations in the kagome-lattice metallic antiferromagnet Fe${}_{0.89}$Co${}_{0.11}$Sn
• Electronic Correlation Effects on Stabilizing a Perfect Kagome Lattice and Ferromagnetic Fluctuation in LaRu${}_3$Si${}_2$
• Electronic and dynamical properties of cobalt monogermanide CoGe phases under pressure
• Optical anisotropy of the kagome magnet FeSn: Dominant role of excitations between kagome and Sn layers
• Anomalous magnetoresistance in an antiferromagnetic Kagome semimetal heterostructures
• Reactivity of ultra-thin Kagome Metal FeSn towards Oxygen and Water
• Symmetry Enhanced Unconventional Spin Current Anisotropy in a Collinear Antiferromagnet
• Anisotropic response of defect bound states to magnetic field in epitaxial FeSn films
• Magnetism of kagome metals $\left({\text{Fe}}_{1-x}{\text{Co}}_x\right)\text{Sn}$ studied by $\mu$SR
• Massive Dirac states bound to vortices by a boson-fermion interaction
• Engineering magnetic anisotropy and ferromagnetism in topological Kagome metal GdV6Sn6 via Nd substitution