Nontrivial Berry phase in magnetic BaMnSb2 semimetal

Abstract

The subject of topological materials has attracted immense attention in condensed-matter physics, because they host new quantum states of matter containing Dirac, Majorana, or Weyl fermions. Although Majorana fermions can only exist on the surface of topological superconductors, Dirac and Weyl fermions can be realized in both 2D and 3D materials. The latter are semimetals with Dirac/Weyl cones either not tilted (type I) or tilted (type II). Although both Dirac and Weyl fermions have massless nature with the nontrivial Berry phase, the formation of Weyl fermions in 3D semimetals require either time-reversal or inversion symmetry breaking to lift degeneracy at Dirac points. Here, we demonstrate experimentally that canted antiferromagnetic BaMnSb2 is a 3D Weyl semimetal with a 2D electronic structure. The Shubnikov-de Hass oscillations of the magnetoresistance give nearly zero effective mass with high mobility and the nontrivial Berry phase. The ordered magnetic arrangement (ferromagnetic ordering in the ab plane and antiferromagnetic ordering along the c axis below 286 K) breaks the time-reversal symmetry, thus offering us an ideal platform to study magnetic Weyl fermions in a centrosymmetric material.

References in corpus (21)

• Topological Insulators
• Topological insulators and superconductors
• Berry Phase Effects on Electronic Properties
• Dirac semimetal in three dimensions
• Topological Insulator Materials
• Ultrahigh mobility and giant magnetoresistance in the Dirac semimetal Cd${}_3$As${}_2$
• Quantum transport evidence for a three-dimensional Dirac semimetal phase in Cd3As2
• Negative Magnetoresistance in Dirac Semimetal Cd3As2
• Discovery of Weyl fermion semimetals and topological Fermi arc states
• Anisotropic Dirac fermions in a Bi square net of SrMnBi2
• Phase analysis of quantum oscillations in graphite
• Quantum Hall effect in a bulk antiferromagnet EuMnBi${}_2$ with magnetically confined two-dimensional Dirac fermions
• Anomalous Nernst Effect in Dirac Semimetal Cd3As2
• A magnetic topological semimetal Sr1-yMn1-zSb2 (y, z< 0.1)
• Quantum transport of two-dimensional Dirac fermions in SrMnBi2
• Two dimensional Dirac fermions and quantum magnetoresistance in CaMnBi${}_2$
• Effect of Eu magnetism on the electronic properties of the candidate Dirac material EuMnBi2
• Dirac and Normal Fermions in Graphite and Graphene: Implications to the Quantum Hall Effect
• Nearly massless Dirac fermions hosted by Sb square net in BaMnSb2
• Electron-hole asymmetry, Dirac fermions, and quantum magnetoresistance in BaMnBi2
• Observation of well-defined quasi-particle over a wide energy range in quasi-2D system

Cited by in corpus (45)

• Electronic Transport and quantum oscillation of Topological Semimetals
• A magnetic topological semimetal Sr1-yMn1-zSb2 (y, z< 0.1)
• Topological Semimetals in Square-Net Materials
• Prediction of Weyl semimetal, AFM topological insulator, nodal line semimetal, and Chern insulator phases in Bi2MnSe4
• Observation of two-dimensional Fermi surface and Dirac dispersion in YbMnSb${}_2$
• Spin-valley locking, bulk quantum Hall effect and chiral surface state in a noncentrosymmetric Dirac semimetal BaMnSb${}_2$
• Bulk quantum Hall effect of spin-valley-coupled Dirac fermions in a polar antiferromagnet BaMnSb${}_2$
• Magnetic mixed valent semimetal EuZnSb${}_2$ with Dirac states in the band structure
• Impact of antiferromagnetic order on Landau level splitting of quasi-two-dimensional Dirac fermions in EuMnBi${}_2$
• A de Hass-van Alphen study of the Type-II Dirac semimetal candidates $A$Te${}_2$ ($A=$ Pt, Pd)
• Crystal growth, microstructure and physical properties of SrMnSb${}_2$
• Fermions and bosons in nonsymmorphic PdSb2 with sixfold degeneracy
• Non-trivial topology in a layered Dirac nodal-line semimetal candidate SrZnSb${}_2$ with distorted Sb square nets
• Magnetic order induces symmetry breaking in the single crystalline orthorhombic CuMnAs semimetal
• Dirac Fermions and Possible Weak Antilocalization in LaCuSb${}_2$
• Magnetic structures, spin-flop transition and coupling of Eu and Mn magnetism in the Dirac semimetal EuMnBi${}_2$
• Magnetic Field Induced Weyl Semimetal from Wannier-Function-based Tight-Binding Model
• Strong and Tunable Electrical-Anisotropy in Type-II Weyl Semimetal Candidate WP2 with Broken Inversion Symmetry
• Quantum oscillations and Dirac dispersion in the BaZnBi2 semimetal guaranteed by local Zn vacancy order
• Tunable spin-valley coupling in layered polar Dirac metals
• Simple mechanisms that impede the Berry phase identification from magneto-oscillations
• Anisotropic Berry phase in the Dirac nodal-line semimetal ZrSiS: The effect of spin-orbit coupling
• Magnetic and electronic structure of the topological semimetal YbMnSb${}_2$
• Magnetic tuning of band topology evidenced by exotic quantum oscillations in the Dirac semimetal EuMnSb${}_2$
• Twisted nodal wires and three-dimensional quantum spin Hall effect in distorted square-net compounds
• Enhancing thermopower and Nernst signal of high-mobility Dirac carriers by Fermi level tuning in the layered magnet EuMnBi${}_2$
• Magneto-transport properties of proposed triply degenerate topological semimetal Pd${}_3$Bi${}_2$S${}_2$
• Quasi-2D magnetism and origin of the Dirac semimetallic behavior in nonstoichiometric Sr${}_{1-y}$Mn${}_{1-z}$Sb${}_2$ (y, z~$<$0.1)
• Atoms to topological electronic materials: A bedtime story for beginners
• Spin dynamics of a magnetic Weyl semimetal Sr${}_{1-x}$Mn${}_{1-y}$Sb${}_2$
• Unified low-energy effective Hamiltonian and the band topology of $p$-block square-net layer derivatives
• High-field Studies on Layered Magnetic and Polar Dirac Metals
• Coexistence of Dirac fermion and charge density wave in square-net-based semimetal LaAuSb2
• Spin Dynamics in the Antiferromagnetic Oxypnictides and Fluoropnictides: LaMnAsO, LaMnSbO, and BaMnAsF
• Unusual Electronic Structure of Dirac Material BaMnSb${}_2$ Revealed by Angle-Resolved Photoemission Spectroscopy
• Massive Dirac fermions in layered BaZnBi${}_2$
• Observation of quantum oscillations, linear magnetoresistance, and crystalline electric field effect in quasi-two-dimensional PrAgBi${}_2$
• Molecular beam deposition of a new layered pnictide with distorted Sb square nets
• Shubnikov-de Haas oscillations and planar Hall effect in HfTe2
• Antiferromagnetism and spin density waves in 3D Dirac semimetals
• C-type antiferromagnetic structure of topological semimetal CaMnSb${}_2$
• Evidence of Spin-Valley Coupling in Dirac Material BaMnBi2 Probed by Quantum Hall Effect and Nonlinear Hall Effect
• Field-induced metal-to-insulator transition and colossal anisotropic magnetoresistance in a nearly Dirac material EuMnSb${}_2$
• Fermi surface and Berry phase analysis for Dirac nodal line semimetals: cautionary tale to SrGa${}_2$ and BaGa${}_2$
• Magnetotransport in Topological Materials and Nonlinear Hall Effect via First-Principles Electronic Interactions and Band Topology