Experimental demonstration of a magnetically induced warping transition in a topological insulator mediated by rare-earth surface dopants
arXiv:2302.01684 · doi:10.1021/acs.nanolett.3c00587
Abstract
Magnetic topological insulators (MTI) constitute a novel class of materials where the topologically protected band structure coexists with long-range ferromagnetic order, which can lead to the breaking of time-reversal symmetry (TRS), introducing a bandgap in the Dirac cone-shaped topological surface state (TSS). The gap opening in MITs has been predicted to be accompanied by a distortion in the TSS, evolving its warped shape from hexagonal to trigonal. In this work, we demonstrate such a transition by means of angle-resolved photoemission spectroscopy after the deposition of low concentrations of magnetic rare earths, namely Er and Dy, on the ternary three-dimensional prototypical topological insulator BiSeTe. Signatures of the gap opening occurring as a consequence of the TRS breaking have also been observed, whose existence is supported by the observation of the aforementioned transition. Moreover, increasing the Er coverage results in a tunable p-type doping of the TSS. As a consequence, the Fermi level (E) of our BiSeTe crystals can be gradually tuned towards the TSS Dirac point, and therefore to the magnetically induced bandgap; thus fulfilling two of the necessary prerequisites for the realization of the quantum anomalous Hall effect (QAHE) in this system. The experimental results are rationalized by a theoretical model where a magnetic Zeeman out-of-plane term is introduced in the hamiltonian governing the TSS band dispersion. Our results offer new strategies to control magnetic interactions with TSSs based on a simple approach and open up viable routes for the realization of the QAHE.
References in corpus (35)
- Topological Insulators
- 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
- Quantized Anomalous Hall Effect in Magnetic Topological Insulators
- Prediction and observation of the first antiferromagnetic topological insulator
- High-precision realization of robust quantum anomalous Hall state in a hard ferromagnetic topological insulator
- Topological quantization of the spin Hall effect in two-dimensional paramagnetic semiconductors
- Hexagonal Warping Effects in the Surface States of Topological Insulator BiTe
- Magnetic impurities on the surface of a topological insulator
- A topological insulator surface under strong Coulomb, magnetic and disorder perturbations
- Hedgehog Spin-texture and Berry's Phase tuning in a Magnetic Topological Insulator
- Spatial Fluctuations of Helical Dirac Fermions on the Surface of Topological Insulators
- Carrier-independent ferromagnetism and giant anomalous Hall effect in magnetic topological insulator
- Large magnetic gap at the Dirac point in a Mn-induced BiTe heterostructure
- Photoemission Spectroscopy of Magnetic and Non-magnetic Impurities on the Surface of the BiSe Topological Insulator
- Tolerance of topological surface states towards magnetic moments: Fe on Bi2Te3 and Bi2Se3
- Dynamics of magnetization on the topological surface
- In-plane magnetic anisotropy of Fe atoms on BiSe(111)
- Electric charging of magnetic textures on the surface of a topological insulator
- Magnetize Topological Surface States of Bi2Se3 with a CrI3 Monolayer
- Coincidence of Superparamagnetism and perfect quantization in the Quantum Anomalous Hall state
- Growth and Characterization of Hybrid Insulating Ferromagnet-Topological Insulator Heterostructure Devices
- Ternary Tetradymite Compounds as Topological Insulators
- Topological Surface States with Persistent High Spin Polarization across Dirac Point in BiTeSe and BiSeTe
- Current induced magnetization reversal on the surface of a topological insulator
- Observation of Distinct Bulk and Surface Chemical Environments in a Topological Insulator under Magnetic doping
- Absence of magnetic-proximity effect at the interface of BiSe and (Bi,Sb)Te with EuS
- Domain Wall Motion in Thin-Film Magnets/ Topological Insulator Junctions
- Microscopic effects of Dy-doping in the topological insulator Bi2Te3
- Incipient antiferromagnetism in the Eu-doped topological insulator BiTe
- Dirac electrons and domain walls: a realization in junctions of ferromagnets and topological insulators
- A Molecular Approach for Engineering Interfacial Interactions in Magnetic-Topological Insulator Heterostructures
- Magnetic warping in topological insulators
- Mesoscopic electron focusing in topological insulators
- Momentum-inversion symmetry breaking on the Fermi surface of magnetic topological insulators