Multiple magnetism controlled topological states in EuAgAs

Abstract

The interplay between magnetism and band topology is a focus of current research on magnetic topological systems. Based on first-principle calculations and symmetry analysis, we reveal multiple intriguing topological states can be realized in a single system EuAgAs, controlled by the magnetic ordering. The material is Dirac semimetal in the paramagnetic state, with a pair of accidental Dirac points. Under different magnetic configurations, the Dirac points can evolve into magnetic triply-degenerate points, magnetic linear and double Weyl points, or being gapped out and making the system a topological mirror semimetal characterized by mirror Chern numbers. The change in bulk topology is also manifested in the surface states, including the surface Fermi arcs and surface Dirac cones. In addition, the antiferromagnetic states also feature a nontrivial Z4 index, implying a higher order topology. These results deepen our understanding of magnetic topological states and provide new perspectives for spintronic applications.

arXiv comment8 pages,7 figures

References in corpus (45)

• Topological Insulators
• Topological insulators and superconductors
• Spintronics: Fundamentals and applications
• Electronic Structure of Pyrochlore Iridates: From Topological Dirac Metal to Mott Insulator
• Weyl and Dirac Semimetals in Three Dimensional Solids
• Topological Insulators with Inversion Symmetry
• Classification of topological quantum matter with symmetries
• WannierTools: An open-source software package for novel topological materials
• Weyl Semimetal in a Topological Insulator Multilayer
• Topological Crystalline Insulators
• Dirac semimetal and topological phase transitions in A3Bi (A=Na, K, Rb)
• Three Dimensional Dirac Semimetal and Quantum Transports in Cd3As2
• Theoretical Discovery/Prediction: Weyl Semimetal states in the TaAs material (TaAs, NbAs, NbP, TaP) class
• Chern semi-metal and Quantized Anomalous Hall Effect in HgCr2Se4
• Topological Crystalline Insulators in the SnTe Material Class
• Weyl semimetal phase in non-centrosymmetric transition metal monophosphides
• Beyond Dirac and Weyl fermions: Unconventional quasiparticles in conventional crystals
• The (High Quality) Topological Materials In The World
• Intrinsic magnetic topological insulators in van der Waals layered MnBi${}_2$Te${}_4$-family materials
• Assessing the Performance of Recent Density Functionals for Bulk Solids
• Catalogue of Topological Electronic Materials
• Topological axion states in magnetic insulator MnBi${}_2$Te${}_4$ with the quantized magnetoelectric effect
• Towards ideal topological materials: Comprehensive database searches using symmetry indicators
• Surface States of the Topological Insulator Bi_{1-x}Sb_x
• Multi-Weyl Topological Semimetals Stabilized by Point Group Symmetry
• High-throughput calculations of magnetic topological materials
• A new type of Weyl semimetal with quadratic double Weyl fermions in SrSi2
• Experimental Observation of Three-Component 'New Fermions' in Topological Semimetal MoP
• Higher-order Topology of Axion Insulator EuIn${}_2$As${}_2$
• Triple Point Topological Metals
• Topological Semimetals with Triply Degenerate Nodal Points in θ-phase Tantalum Nitride
• Quantized Response and Topology of Insulators with Inversion Symmetry
• Non-Abelian band topology in noninteracting metals
• Strong and Fragile Topological Dirac Semimetals with Higher-Order Fermi Arcs
• Two-dimensional Weyl Half Semimetal and Tunable Quantum Anomalous Hall Effect in Monolayer PtCl${}_3$
• Coexistence of four-band nodal rings and triply-degenerate nodal points in centrosymmetric metal diborides
• New fermions on the line in topological symmorphic metals
• Three-component fermions with surface Fermi arcs in topological semimetal tungsten carbide
• Dirac semimetal in type IV magnetic space group
• Magnetic semimetals and quantized anomalous Hall effect in EuB6
• Ferromagnetic hybrid nodal loop and switchable type-I and type-II Weyl fermions in two-dimension
• Topological Hall effect in the antiferromagnetic Dirac semimetal EuAgAs
• From triple-point materials to multiband nodal links
• Composite Dirac Semimetal
• First-principles study on the bulk and two-dimensional structures of AMnBi(A =K, Rb, Cs)-family materials

Cited by in corpus (9)

• The magnetic structure of the topological semimetal Co${}_3$Sn${}_2$S${}_2$
• Third-order charge transport in a magnetic topological semimetal
• Field-controlled quantum anomalous Hall effect in electron-doped CrSiTe${}_3$ monolayer: a first-principles prediction
• Structure, physical properties, and magnetically tunable topological phases in topological semimetal EuCuBi
• Magnetic hourglass fermions: from exhaustive symmetry conditions to high-throughput materials predictions
• Ultrafast photoinduced phase transition in the antiferromagnetic Dirac semimetal EuAgAs
• EuAuSb: An odd-parity helical variation on altermagnetism
• A new ferromagnetic semiconductor system of Eu${}_{1-x}$Sr${}_x$AgP $(x=0.0-0.6)$ compounds: Crystallographic, magnetic, and magneto-resistive properties
• Design, synthesis, and physical properties of the intergrowth compound Eu${}_2$CuZn${}_2$As${}_3$