Surface magnetic ordering in topological insulators with bulk magnetic dopants

Abstract

We show that a three dimensional topological insulator doped with magnetic impurities in the bulk can have a regime where the surface is magnetically ordered but the bulk is not. This is in contrast to conventional materials where bulk ordered phases are typically more robust than surface ordered phases. The difference originates from the topologically protected gapless surface states characteristic of topological insulators. We study the problem using a mean field approach in two concrete models that give the same qualitative result, with some interesting differences. Our findings could help explain recent experimental results showing the emergence of a spectral gap in the surface state of Bi2Se3 doped with Mn or Fe atoms, but with no measurable bulk magnetism.

8 pages, 6 figures

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Cited by in corpus (53)

• Gapless surface Dirac cone in antiferromagnetic topological insulator MnBi${}_2$Te${}_4$
• Large magnetic gap at the Dirac point in a Mn-induced Bi${}_2$Te${}_3$ heterostructure
• Surface State Magnetization and Chiral Edge States on Topological Insulators
• Imaging Dirac-Mass Disorder from Magnetic Dopant-Atoms in the Ferromagnetic Topological Insulator Cr${}_x$(Bi${}_{0.1}$Sb${}_{0.9}$)${}_{2-x}$Te${}_3$
• Weyl superconductors
• Odd-frequency superconductivity
• Magnetic proximity effect at the 3D topological insulator/magnetic insulator interface
• Interplay between ferromagnetism, surface states, and quantum corrections in a magnetically doped topological insulator
• Transport in two-dimensional topological materials: recent developments in experiment and theory
• Mn-rich MnSb2Te4: A topological insulator with magnetic gap closing at high Curie temperatures of 45-50 K
• Nonmagnetic band gap at the Dirac point of the magnetic topological insulator (Bi${}_{1-x}$Mn${}_x{)}_2$Se${}_3$
• Chemical potential dependent gap-opening at the Dirac surface states of Bi2Se3 induced by aggregated substitutional Cr atoms
• Proximity-induced unconventional superconductivity in topological insulators
• Magnetized Topological Insulator Multilayers
• Systematics of electronic and magnetic properties in the transition metal doped Sb${}_2$Te${}_3$ quantum anomalous Hall platform
• Helical edge states coupled to a spin bath: Current-induced magnetization
• Self-consistent theory of ferromagnetism on the surface of a topological insulator
• Proximity-Induced Odd-Frequency Superconductivity in a Topological Insulator
• Weyl semimetal phase in solid-solution narrow-gap semiconductors
• Odd-frequency superconductivity and Meissner effect in the doped topological insulator Bi${}_2$Se${}_3$
• Topological orders competing for the Dirac surface state in FeSeTe surfaces
• Spin Response of Electrons on the Surface of a Topological Insulator
• Synchrotron radiation induced magnetization in magnetically-doped and pristine topological insulators
• Dynamics of domain-wall Dirac fermions on a topological insulator: a chiral fermion beam splitter
• Carrier dependent ferromagnetism in chromium doped topological insulator $C{r}_{0.2}B{i}_{x}S{b}_{1.8-x}T{e}_3$
• Gapless Topological Superconductors - Model Hamiltonian and Realization
• Anisotropic conductivity in magnetic topological insulators
• Surface Magnetism in Topological Crystalline Insulators
• Effects of surface-bulk hybridization in 3D topological `metals'
• Magnetism-induced massive Dirac spectra and topological defects in the surface state of Cr-doped Bi${}_2$Se${}_3$-bilayer topological insulators
• Temperature Induced Spin Density Wave in Magnetic Doped Topological Insulators
• Topological insulator ring with magnetic impurities
• Transport in magnetically doped topological insulators: Effects of magnetic clusters
• Spin-spin interaction in the bulk of topological insulators
• Weyl Semimetal from the Honeycomb Array of Topological Insulator Nanowires
• Characterizing and Overcoming Surface Paramagnetism in Magnetoelectric Antiferromagnets
• Ambi-chiral anomalous Hall effect in magnetically doped topological insulators
• Manipulating Spin-Lattice Coupling in Layered Magnetic Topological Insulator Heterostructure $via$ Interface Engineering
• Chiral Hall effect in the kink states in topological insulators with magnetic domain walls
• Magnetization relaxation and search for the magnetic gap in bulk-insulating V-doped (Bi, Sb)${}_2$Te${}_3$
• Temperature-dependent spin-resolved electronic structure of EuO thin films
• Search for enhanced magnetism at the interface between Bi${}_2$Se${}_3$ and EuSe
• The Anomalous Hall Effect in Magnetic Topological Insulators
• Topological superconductivity in an ultrathin, magnetically-doped topological insulator proximity coupled to a conventional superconductor
• Spin Stiffness and Domain Walls in Dirac-Electron Mediated Magnets
• Collective excitations in magnetic topological insulators and axion dark matter search
• Proximity effect and inverse proximity effect in a topological-insulator/iron-based-superconductor heterostructure
• Structural, Surface Morphology and Magneto-Transport properties of Self Flux Grown Eu Doped Bi2Se3 Single Crystal
• Topology-insensitive axion mass in magnetic topological insulators
• Antiferromagnetism and spin density waves in 3D Dirac semimetals
• Transmission of charge and spin in a topological-insulator-based magnetic structure
• Mössbauer parameters of ${}^{57}$Fe substituents in the topological insulator $B{i}_{2}S{e}_3$
• Localized magnetic moments in a Dirac semimetal as a spin model with long--range interactions