Chemical potential dependent gap-opening at the Dirac surface states of Bi2Se3 induced by aggregated substitutional Cr atoms

Abstract

With angle-resolved photoemission spectroscopy, gap-opening is resolved at up to room temperature in the Dirac surface states of molecular beam epitaxy grown Cr-doped Bi2Se3 topological insulator films, which however show no long-range ferromagnetic order down to 1.5 K. The gap size is found decreasing with increasing electron doping level. Scanning tunneling microscopy and first principles calculations demonstrate that substitutional Cr atoms aggregate into superparamagnetic multimers in Bi2Se3 matrix, which contribute to the observed chemical potential dependent gap-opening in the Dirac surface states without long-range ferromagnetic order.

arXiv comment20 pages, 4 figures

References in corpus (24)

• Topological Insulators
• Topological insulators and superconductors
• Topological Insulators in Three Dimensions
• Experimental Observation of the Quantum Anomalous Hall Effect in a Magnetic Topological Insulator
• Discovery (theoretical prediction and experimental observation) of a large-gap topological-insulator class with spin-polarized single-Dirac-cone on the surface
• 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
• Quantized Anomalous Hall Effect in Magnetic Topological Insulators
• First observation of Spin-Momentum Helical Locking in Bi2Se3 and Bi2Te3, demonstration of Topological-Order at 300K and a realization of topological-transport-regime
• Ferromagnetism in semiconductors and oxides: prospects from a ten years' perspective
• Crossover of Three-Dimensional Topological Insulator of Bi2Se3 to the Two-Dimensional Limit
• Seeing the magnetic monopole through the mirror of topological surface states
• Gate-Voltage Control of Chemical Potential and Weak Anti-localization in Bismuth Selenide
• Magnetic impurities on the surface of a topological insulator
• The development of ferromagnetism in the doped topological insulator Bi2-xMnxTe3
• Hedgehog Spin-texture and Berry's Phase tuning in a Magnetic Topological Insulator
• Co-occurrence of Superparamagnetism and Anomalous Hall Effect in Highly Reduced Cobalt Doped Rutile TiO2 Films
• Surface quantized anomalous Hall current and magneto-electric effect in magnetically disordered topological insulators
• Crossover between weak localization and weak antilocalization in magnetically doped topological insulator
• Origin and control of high-temperature ferromagnetism in semiconductors
• Competition between weak localization and antilocalization in topological surface states
• Carrier-independent ferromagnetism and giant anomalous Hall effect in magnetic topological insulator
• Surface magnetic ordering in topological insulators with bulk magnetic dopants
• Strong single-ion anisotropy and anisotropic interactions of magnetic adatoms induced by topological surface states

Cited by in corpus (45)

• Colloquium: Quantum anomalous Hall effect
• Precise quantization of anomalous Hall effect near zero magnetic field
• Large magnetic gap at the Dirac point in a Mn-induced Bi${}_2$Te${}_3$ heterostructure
• Spin scattering and noncollinear spin structure-induced intrinsic anomalous Hall effect in antiferromagnetic topological insulator $\mathrm{MnB}{\mathrm{i}}_2\mathrm{T}{\mathrm{e}}_4$
• Natural van der Waals heterostructural single crystals with both magnetic and topological properties
• Tuning Chern Number in Quantum Anomalous Hall Insulators
• Visualization of superparamagnetic dynamics in magnetic topological insulators
• Transport in two-dimensional topological materials: recent developments in experiment and theory
• Large-gap magnetic topological heterostructure formed by subsurface incorporation of a ferromagnetic layer
• Quantum Anomalous Hall Effect in Time-Reversal-Symmetry Breaking Topological Insulators
• Proximity Driven Enhanced Magnetic Order at Ferromagnetic Insulator / Magnetic Topological Insulator Interface
• Experimental Verification of Van Vleck Nature of Long-Range Ferromagnetic Order in Vanadium-Doped Three-Dimensional Topological Insulator Sb${}_2$Te${}_3$
• Direct evidence of ferromagnetism in a quantum anomalous Hall system
• Magnetic proximity effect at Bi${}_2$Se${}_3$/EuS interface with broken inversion symmetry
• Robust gapless surface state and Rashba-splitting bands upon surface deposition of magnetic Cr on Bi${}_2$Se${}_3$
• Direct evidence of ferromagnetism in MnSb2Te4
• Evidence for exchange Dirac gap in magneto-transport of topological insulator-magnetic insulator heterostructures
• Zero Magnetic Field Plateau Phase Transition in Higher Chern Number Quantum Anomalous Hall Insulators
• Breaking time reversal symmetry in topological insulators
• Engineering the breaking of time-reversal symmetry in gate-tunable hybrid ferromagnet/topological insulator heterostructures
• Mass acquisition of Dirac fermions in Cr-doped topological insulator Sb2Te3 films
• Microscopic effects of Dy-doping in the topological insulator Bi2Te3
• Incipient antiferromagnetism in the Eu-doped topological insulator Bi${}_2$Te${}_3$
• Electronic Fingerprints of Cr and V Dopants in Topological Insulator Sb2Te3
• Superexchange dominates in magnetic topological insulators
• Ferromagnetic Anomalous Hall Effect in Cr-doped Bi${}_2$Se${}_3$ Thin Films via Surface-State Engineering
• Sign change in the anomalous Hall effect and strong transport effects in a 2D massive Dirac metal due to spin-charge correlated disorder
• Realization of Stable Ferromagnetic Order in Topological Insulator: Codoping Enhanced Magnetism in 4f Transition Metal Doped Bi2Se3
• Distinct Effects of Cr Bulk Doping and Surface Deposition on the Chemical Environment and Electronic Structure of the Topological Insulator Bi2Se3
• Dilute magnetic topological semiconductors: What's new beyond the physics of dilute magnetic semiconductors?
• Influence of an anomalous temperature-dependence of the phase coherence length on the conductivity of magnetic topological insulators
• Magnetism-induced massive Dirac spectra and topological defects in the surface state of Cr-doped Bi${}_2$Se${}_3$-bilayer topological insulators
• Topological Phase Transitions Induced by Disorder in Magnetically Doped (Bi, Sb)${}_2$Te${}_3$ Thin Films
• Robust Gapless Surface State against Surface Magnetic Impurities on (Bi${}_{0.5}$Sb${}_{0.5}$)${}_2$Te${}_3$ Evidenced by In Situ Magnetotransport Measurements
• Evolution of Dopant-Concentration-Induced Magnetic Exchange Interaction in Topological Insulator Thin Films
• Residual gas absorption effect on the electronic structure of Cr-doped Bi2Se3
• Magnetization relaxation and search for the magnetic gap in bulk-insulating V-doped (Bi, Sb)${}_2$Te${}_3$
• Topological transitions to Weyl states in bulk Bi${}_2$Se${}_3$: Effect of hydrostatic pressure and doping
• Gap and spin texture engineering of Dirac topological states at the Cr-Bi${}_2$Se${}_3$ interface
• Phonon and defect mediated quantum anomalous Hall insulator to metal transition in magnetically doped topological insulators
• Long Range Magnetic order stabilized by acceptors
• Axion insulator, Weyl points, quantum anomalous Hall effect and magnetic topological phase transition in Eu3In2As4
• Interlayer Coupling-Induced Quantum Phase Transition in Quantum Anomalous Hall Multilayers
• Carrier free long-range magnetism in Mo doped one quintuple layer Bi2Te3 and Sb2Te3
• Interlayer Exchange Coupling-Induced Critical-Metal-to-Insulator Phase Transition in Quantum Anomalous Hall Insulators