Dual nature of magnetic dopants and competing trends in topological insulators

Abstract

Topological insulators interacting with magnetic impurities have been reported to host several unconventional effects. These phenomena are described within the framework of gapping Dirac quasiparticles due to broken time-reversal symmetry. However, the overwhelming majority of studies demonstrate the presence of a finite density of states near the Dirac point even once Topological insulators become magnetic. Here, we map the response of topological states to magnetic impurities at the atomic scale. We demonstrate that magnetic order and gapless states can coexist. We show how this is the result of the delicate balance between two opposite trends, i.e. gap opening and emergence of a Dirac node impurity band, both induced by the magnetic dopants. Our results evidence a more intricate and rich scenario with respect to the once generally assumed, showing how different electronic and magnetic states may be generated and controlled in this fascinating class of materials.

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• Dirac materials
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• The development of ferromagnetism in the doped topological insulator Bi2-xMnxTe3
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Cited by in corpus (40)

• Large magnetic gap at the Dirac point in a Mn-induced Bi${}_2$Te${}_3$ heterostructure
• Large-gap magnetic topological heterostructure formed by subsurface incorporation of a ferromagnetic layer
• Probing topological quantum matter with scanning tunnelling microscopy
• Mn-rich MnSb2Te4: A topological insulator with magnetic gap closing at high Curie temperatures of 45-50 K
• Designing light-element materials with large effective spin-orbit coupling
• Systematics of electronic and magnetic properties in the transition metal doped Sb${}_2$Te${}_3$ quantum anomalous Hall platform
• Disorder enabled band structure engineering of a topological insulator surface
• Magnetic and defect probes of the SmB${}_6$ surface state
• Mapping the Dirac fermions in intrinsic antiferromagnetic topological insulators (MnBi${}_2$Te${}_4$)(Bi${}_2$Te${}_3$)${}_n$ (n=0, 1)
• Spectroscopic perspective on the interplay between electronic and magnetic properties of magnetically doped topological insulators
• Quantum Oscillations in iron-doped topological insulator Sb2Te3 crystals
• Impurity states in the magnetic topological insulator V:(Bi,Sb)${}_2$Te${}_3$
• The topological surface state of $\alpha$-Sn on InSb(001) as studied by photoemission
• Imaging the Real Space Structure of the Spin Fluctuations in an Iron-based superconductor
• Do topology and ferromagnetism cooperate at the EuS/Bi${}_2$Se${}_3$ interface?
• Impurity scattering on the surface of topological insulator thin films
• Severe Dirac Mass Gap Suppression in Sb_2Te_3-based Quantum Anomalous Hall Materials
• Electronic Fingerprints of Cr and V Dopants in Topological Insulator Sb2Te3
• Realization of the Chern insulator and Axion insulator phases in antiferromagnetic $MnTe$-$B{i}_2(Se,Te{)}_3$-$MnTe$ heterostructures
• Universal response of the type-II Weyl semimetals phase diagram
• Impurity screening and stability of Fermi arcs against Coulomband magnetic scattering in a Weyl monopnictide
• Non-magnetic ground state of Ni adatoms on Te-terminated bismuth chalcogenide topological insulators
• Velocity-determined anisotropic behaviors of RKKY interaction in 8-\textit{Pmmn} borophene
• Instability of the topological surface state in Bi${}_2$Se${}_3$ upon deposition of gold
• Magnetic properties of Mn-doped Bi${}_2$Se${}_3$ topological insulators: ab initio calculations
• Ab initio investigation of impurity-induced in-gap states in Bi${}_2$Te${}_3$ and Bi${}_2$Se${}_3$
• Spin dynamics of $3d$ and $4d$ impurities embedded in prototypical topological insulators
• Ambi-chiral anomalous Hall effect in magnetically doped topological insulators
• Spontaneous ferromagnetism and finite surface energy gap in the topological insulator Bi${}_2$Se${}_3$ from surface Bi$_\rm{Se}$ antisite defects
• Magnetization relaxation and search for the magnetic gap in bulk-insulating V-doped (Bi, Sb)${}_2$Te${}_3$
• Induced Spin-texture at 3$d$ Transition Metal/Topological Insulator Interfaces
• Wave-particle duality of electrons with spin-momentum locking
• Phonon and defect mediated quantum anomalous Hall insulator to metal transition in magnetically doped topological insulators
• Dirac node engineering and flat bands in doped Dirac materials
• Electron scattering by magnetic impurity in Weyl semimetals
• Ultrafast electron dynamics in a topological surface state observed in two-dimensional momentum space
• Doping-controlled surface conduction in topological insulators with warping effects
• Impurity-potential-induced gap at the Dirac point of topological insulators with in-plane magnetization
• In-gap states of magnetic impurity in quantum spin Hall insulator proximitized to a superconductor
• Chiral edge transport along domain walls in magnetic topological insulator nanoribbons