Coexistence of Surface Ferromagnetism and Gapless Topological State in MnBi${}_2$Te${}_4$

Abstract

Surface magnetism and its correlation with the electronic structure are critical to understand the gapless topological surface state in the intrinsic magnetic topological insulator MnBi${}_2$Te${}_4$. Here, using static and time resolved angle-resolved photoemission spectroscopy (ARPES), we find a significant ARPES intensity change together with a gap opening on a Rashba-like conduction band. Comparison with a model simulation strongly indicates that the surface magnetism on cleaved MnBi${}_2$Te${}_4$ is the same as its bulk state. The coexistence of surface ferromagnetism and a gapless TSS uncovers the novel complexity of MnBi${}_2$Te${}_4$ that may be responsible for the low quantum anomalous Hall temperature of exfoliated MnBi${}_2$Te${}_4$.

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Cited by in corpus (48)

• Colloquium: Quantum anomalous Hall effect
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• Evolution of Magnetic Interactions in Sb-substituted MnBi2Te4
• Multiple magnetic topological phases in bulk van der Waals crystal MnSb4Te7
• Routes to realize the axion-insulator phase in MnBi${}_2$Te${}_4$(Bi${}_2$Te${}_3$)${}_n$ family: a perspective
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• Distinct magnetic gaps between antiferromagnetic and ferromagnetic orders driven by surface defects in the topological magnet MnBi2Te4
• Visualizing the interplay of Dirac mass gap and magnetism at nanoscale in intrinsic magnetic topological insulators
• Light-Tunable Surface State and Hybridization Gap in Magnetic Topological Insulator MnBi${}_8$Te${}_{13}$
• Quantum Imaging of Magnetic Phase Transitions and Spin Fluctuations in Intrinsic Magnetic Topological Nanoflakes
• Large Itinerant Electron Exchange Coupling in the Magnetic Topological Insulator MnBi2Te4
• Intrinsic Magnetic Topological Materials
• Delicate Ferromagnetism in MnBi${}_6$Te${}_{10}$
• Approaching a Minimal Topological Electronic Structure in Antiferromagnetic Topological Insulator MnBi2Te4 via Surface Modification
• Nonreciprocal transport in a bilayer of MnBi2Te4 and Pt
• Electrically Controlled Anomalous Hall Effect and Orbital Magnetization in Topological Magnet MnBi2Te4
• Quantum Oscillations in the Field-induced Ferromagnetic State of MnBi${}_{2-x}$Sb${}_x$Te${}_4$
• Fabrication-induced even-odd discrepancy of magnetotransport in few-layer MnBi${}_2$Te${}_4$
• Intrinsic magnetic topological insulators of the MnBi${}_2$Te${}_4$ family
• Realization of the Chern insulator and Axion insulator phases in antiferromagnetic $MnTe$-$B{i}_2(Se,Te{)}_3$-$MnTe$ heterostructures
• On the topological surface states of the intrinsic magnetic topological insulator Mn-Bi-Te family
• Ubiquitous order-disorder transition in the Mn antisite sublattice of the (MnBi${}_2$Te${}_4$)(Bi${}_2$Te${}_3$)${}_n$ magnetic topological insulators
• Observation of magnetism induced topological edge state in antiferromagnetic topological insulator MnBi4Te7
• Dynamical properties of magnetic topological insulator $T$Bi${}_2$Te${}_4$ ($T=$Mn, Fe): phonons dispersion, Raman active modes, and chiral phonons study
• Koopmans' theorem as the mechanism of nearly gapless surface states in self-doped magnetic topological insulators
• Direct visualization of surface spin-flip transition in MnBi4Te7
• Hinge Spin Polarization in Magnetic Topological Insulators Revealed by Resistance Switch
• Layer-by-layer disentanglement of Bloch states via frequency-domain photoemission
• Three-Dirac-fermion approach to unexpected universal gapless surface states of van der Waals magnetic topological insulators
• Topological Electronic Structure Evolution with Symmetry Breaking Spin Reorientation in (Fe${}_{1-x}$Co${}_x$)Sn
• Momentum-inversion symmetry breaking on the Fermi surface of magnetic topological insulators
• Van der Waals engineering of ultrafast carrier dynamics in magnetic heterostructures
• A Dirac-fermion approach and its application to design high Chern numbers in magnetic topological insulator multilayers
• Facet dependent surface energy gap on magnetic topological insulators
• Infrared study of the interplay of charge, spin, and lattice excitations in the magnetic topological insulator EuIn${}_2$As${}_2$
• Toward improved property prediction of 2D materials using many-body quantum Monte Carlo methods
• Absence of a Dirac gap in ferromagnetic Cr${}_x$(Bi${}_{0.1}$Sb${}_{0.9}$)${}_{2-x}$Te${}_3$
• Distinguishing Surface and Bulk Electromagnetism via Their Dynamics in an Intrinsic Magnetic Topological Insulator
• Model studies of topological phase transitions in materials with two types of magnetic atoms
• Stealth Majorana Zero Mode in a Trilayer Heterostructure MnTe/Bi2Te3/Fe(Te,Se)
• Electrostatic effects of the MnBi2Te4-superconductor hetero-structures in chiral Majorana search
• Defect Engineering for Stabilizing Magnetic and Topological Properties in Mn(Bi1-xSbx)2Te4
• Reconstructing the wavefunction of magnetic topological insulators MnBi2Te4 and MnBi4Te7 using spin-resolved photoemission
• Surface Reconstructions in Thin-Films of Magnetic Topological Insulator MnBi${}_2$Te${}_4$
• Defect-induced displacement of topological surface state in quantum magnet MnBi${}_2$Te${}_4$