Universal Role of Combined Symmetry for the Protection of the Dirac Cone in Antiferromagnetic Topological Insulators

Abstract

Antiferromagnetic topological insulators (AF TIs) are predicted to exhibit exotic physical properties such as gigantic optical and topological magnetoelectric responses. While a key to achieving such phenomena relies on how to break the symmetry protecting the Dirac-cone surface state (SS) and acquire the mass of Dirac fermions, the mechanism has yet to be clarified. To address this issue, we carried out micro-focused angle-resolved photoemission spectroscopy for GdBi hosting the type-II AF order, and uncovered the stripe-type 2$\times$1 reconstruction of the Fermi surface associated with the AF band folding. Intriguingly, in contrast to NdBi with the type-I AF order displaying the surface-selective Dirac-fermion mass, GdBi shows massless behavior irrespective of AF domains due to the robust topological protection. These results strongly suggest a crucial role of the ThetaTD (time-reversal and translational) symmetry to create the Dirac-fermion mass in AF TIs.

arXiv comment21 pages, 6 figures

References in corpus (37)

• Topological Insulators in Three Dimensions
• Wannier90: A Tool for Obtaining Maximally-Localised Wannier Functions
• Experimental Observation of the Quantum Anomalous Hall Effect in a Magnetic Topological Insulator
• A topological Dirac insulator in a quantum spin Hall phase : Experimental observation of first strong topological insulator
• Topological Field Theory of Time-Reversal Invariant Insulators
• WannierTools: An open-source software package for novel topological materials
• Quantized Anomalous Hall Effect in Magnetic Topological Insulators
• Topological Crystalline Insulators
• Magnetic-field-induced quantized anomalous Hall effect in intrinsic magnetic topological insulator MnBi${}_2$Te${}_4$
• Electrical switching of an antiferromagnet
• Prediction and observation of the first antiferromagnetic topological insulator
• Magnetoelectric polarizability and axion electrodynamics in crystalline insulators
• Topological axion states in magnetic insulator MnBi${}_2$Te${}_4$ with the quantized magnetoelectric effect
• Robust axion insulator and Chern insulator phases in a two-dimensional antiferromagnetic topological insulator
• Trajectory of Anomalous Hall Effect toward the Quantized State in a Ferromagnetic Topological Insulator
• Antiferromagnetic topological insulators
• Dynamical Axion Field in Topological Magnetic Insulators
• Electrical Manipulation of a Topological Antiferromagnetic State
• Quantized Response and Topology of Insulators with Inversion Symmetry
• Axion Electrodynamics in Topological Materials
• Surfaces of Axion Insulators
• Gate-controllable magneto-optic Kerr effect in layered collinear antiferromagnets
• A Proposal to Detect Dark Matter Using Axionic Topological Antiferromagnets
• Odd-even layer-number effect and layer-dependent magnetic phase diagrams in MnBi2Te4
• Topological Insulators with Commensurate Antiferromagnetism
• Giant nonlinear photocurrent in $\mathcal{P}\mathcal{T}$-symmetric magnetic topological quantum materials
• Giant linearly-polarized photogalvanic effect and second harmonic generation in two-dimensional axion insulators
• On the matter of topological insulators as magnetoelectrics
• Emergence of Fermi arcs and novel magnetic splitting in an antiferromagnet
• Tunable Electronic Structure and Surface States in Rare Earth Mono-Bismuthides with Partially Filled f Shell
• Quantum spin Hall effect induced by non-magnetic and magnetic staggered potentials
• Unusual change in the Dirac-cone energy band upon two-step magnetic transition in CeBi
• Directional effects of antiferromagnetic ordering on the electronic structure in NdSb
• Antiferromagnetic topological insulator with selectively gapped Dirac cones
• Unusual surface states associated with the PT-symmetry breaking and antiferromagnetic band folding in NdSb
• Distinguishing Surface and Bulk Electromagnetism via Their Dynamics in an Intrinsic Magnetic Topological Insulator
• Long-range magnetic order induced surface state in GdBi and DyBi

Cited by in corpus (1)

• Long-range magnetic order induced surface state in GdBi and DyBi