Orbital Complexity in Intrinsic Magnetic Topological Insulators MnBi${}_4$Te${}_7$ and MnBi${}_6$Te${}_{10}$

Abstract

Using angle-resolved photoelectron spectroscopy (ARPES), we investigate the surface electronic structure of the magnetic van der Waals compounds MnBi${}_4$Te${}_7$ and MnBi${}_6$Te${}_{10}$, the $n=$~1 and 2 members of a modular (Bi${}_2$Te${}_3$)${}_n$(MnBi${}_2$Te${}_4$) series, which have attracted recent interest as intrinsic magnetic topological insulators. Combining circular dichroic, spin-resolved and photon-energy-dependent ARPES measurements with calculations based on density functional theory, we unveil complex momentum-dependent orbital and spin textures in the surface electronic structure and disentangle topological from trivial surface bands. We find that the Dirac-cone dispersion of the topologial surface state is strongly perturbed by hybridization with valence-band states for Bi${}_2$Te${}_3$-terminated surfaces but remains preserved for MnBi${}_2$Te${}_4$-terminated surfaces. Our results firmly establish the topologically non-trivial nature of these magnetic van der Waals materials and indicate that the possibility of realizing a quantized anomalous Hall conductivity depends on surface termination.

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Cited by in corpus (33)

• Ferromagnetic-antiferromagnetic coexisting ground states and exchange bias effects in $\mathbf{MnB}{\mathbf{i}}_4\mathbf{T}{\mathbf{e}}_7$ and $\mathbf{MnB}{\mathbf{i}}_6\mathbf{T}{\mathbf{e}}_{10}$
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• Growth, characterization and Chern insulator state in MnBi${}_2$Te${}_4$ via the chemical vapor transport method
• Coexistence of Ferromagnetism and Topology by Charge Carrier Engineering in intrinsic magnetic topological insulator MnBi4Te7
• Intrinsic Magnetic Topological Materials
• Delicate Ferromagnetism in MnBi${}_6$Te${}_{10}$
• Strongly anisotropic spin dynamics in magnetic topological insulators
• Ferromagnetic MnBi4Te7 obtained with low concentration Sb doping: A promising platform for exploring topological quantum states
• Systemic Consequences of Disorder in Magnetically Self-Organized Topological MnBi${}_2$Te${}_4/$(Bi${}_2$Te${}_3$)${}_n$ Superlattices
• Thermal and thermoelectric properties of an antiferromagnetic topological insulator MnBi${}_2$Te${}_4$
• On the topological surface states of the intrinsic magnetic topological insulator Mn-Bi-Te family
• An Integrated Quantum Material Testbed with Multi-Resolution Photoemission Spectroscopy
• Charge Carrier Mediation and Ferromagnetism induced in MnBi6Te10 Magnetic Topological Insulators by antimony doping
• Magnetic warping in topological insulators
• 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
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• Van der Waals engineering of ultrafast carrier dynamics in magnetic heterostructures
• Magnetic topological transistor exploiting layer-selective transport
• A Dirac-fermion approach and its application to design high Chern numbers in magnetic topological insulator multilayers
• Novel magnetic topological insulator FeBi${}_2$Te${}_4$ with controllable topological quantum phase
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• Orbital contributions in the element-resolved valence electronic structure of Bi2Se3
• A sample-position-autocorrection system with precision better than 1 \um~in angle-resolved photoemission experiments
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