Resonantly enhanced photoemission from topological surface states in MnBi${}_6$Te${}_{10}$

Abstract

The dispersion of topological surface bands in MnBi${}_2$Te${}_4$-based magnetic topological insulator heterostructures is strongly affected by band hybridization and is spatially inhomogeneous due to varying surface layer terminations on microscopic length scales. Here, we apply micro-focused angle-resolved photoemission spectroscopy with tunable photon energy from 18 to 30 eV to distinguish bulk valence and conduction bands from surface bands on the three surface terminations of MnBi${}_6$Te${}_{1}0$. We observe a strong enhancement of photoemission intensity from the topological surface bands at the Bi O4 absorption edge, which is exploited to visualize a gapless Dirac cone on the MnBi${}_2$Te${}_4$-terminated surface and varying degrees of hybridization effects in the surface bands on the two distinct Bi${}_2$Te${}_3$-terminated surfaces.

7 pages, 4 figures

References in corpus (13)

• Surface States of the Topological Insulator Bi_{1-x}Sb_x
• Quantum metric nonlinear Hall effect in a topological antiferromagnetic heterostructure
• Quantum metric-induced nonlinear transport in a topological antiferromagnet
• Sample-dependent Dirac point gap in MnBi${}_2$Te${}_4$ and its response to the applied surface charge: a combined photoemission and ab initio study
• Orbital Complexity in Intrinsic Magnetic Topological Insulators MnBi${}_4$Te${}_7$ and MnBi${}_6$Te${}_{10}$
• Ferromagnetic-antiferromagnetic coexisting ground states and exchange bias effects in $\mathbf{MnB}{\mathbf{i}}_4\mathbf{T}{\mathbf{e}}_7$ and $\mathbf{MnB}{\mathbf{i}}_6\mathbf{T}{\mathbf{e}}_{10}$
• Origins of electronic bands in antiferromagnetic topological insulator MnBi${}_2$Te${}_4$
• Quantum geometry quadrupole-induced third-order nonlinear transport in antiferromagnetic topological insulator MnBi2Te4
• Delicate Ferromagnetism in MnBi${}_6$Te${}_{10}$
• Intrinsic magnetic topological insulators of the MnBi${}_2$Te${}_4$ family
• Coherent energy exchange between carriers and phonons in Peierls-distorted bismuth unveiled by broadband XUV pulses
• Facet dependent surface energy gap on magnetic topological insulators
• Reconstructing the wavefunction of magnetic topological insulators MnBi2Te4 and MnBi4Te7 using spin-resolved photoemission