Magnetic Properties and Electronic Structure of Magnetic Topological Insulator MnBi${}_2$Se${}_4$

Abstract

The intrinsic magnetic topological insulators MnBi${}_2$X${}_4$ (X = Se, Te) are promising candidates in realizing various novel topological states related to symmetry breaking by magnetic order. Although much progress had been made in MnBi${}_2$Te${}_4$, the study of MnBi${}_2$Se${}_4$ has been lacking due to the difficulty of material synthesis of the desired trigonal phase. Here, we report the synthesis of multilayer trigonal MnBi${}_2$Se${}_4$ with alternating-layer molecular beam epitaxy. Atomic-resolution scanning transmission electron microscopy (STEM) and scanning tunneling microscopy (STM) identify a well-ordered multilayer van der Waals (vdW) crystal with septuple-layer base units in agreement with the trigonal structure. Systematic thickness-dependent magnetometry studies illustrate the layered antiferromagnetic ordering as predicted by theory. Angle-resolved photoemission spectroscopy (ARPES) reveals the gapless Dirac-like surface state of MnBi${}_2$Se${}_4$, which demonstrates that MnBi${}_2$Se${}_4$ is a topological insulator above the magnetic ordering temperature. These systematic studies show that MnBi${}_2$Se${}_4$ is a promising candidate for exploring the rich topological phases of layered antiferromagnetic topological insulators.

20 pages, 9 figures

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Cited by in corpus (13)

• Colloquium: Quantum anomalous Hall effect
• Intrinsic Magnetic Topological Materials
• Intrinsic magnetic topological insulators of the MnBi${}_2$Te${}_4$ family
• Ubiquitous order-disorder transition in the Mn antisite sublattice of the (MnBi${}_2$Te${}_4$)(Bi${}_2$Te${}_3$)${}_n$ magnetic topological insulators
• Formation of a stable surface oxide in MnBi${}_2$Te${}_4$ thin films
• Tuning the Curie temperature of a 2D magnet/topological insulator heterostructure to above room temperature by epitaxial growth
• Highly Tunable Band Inversion in AB2X4 (A=Ge, Sn, Pb; B=As, Sb, Bi; X=Se, Te) Compounds
• Imaging the breakdown and restoration of topological protection in magnetic topological insulator MnBi${}_2$Te${}_4$
• Kinetically-controlled epitaxial growth of Fe${}_3$GeTe${}_2$ van der Waals ferromagnetic films
• Antiferromagnetic order in a layered magnetic topological insulator MnBi${}_2$Se${}_4$ probed by resonant soft x-ray scattering
• Strain effect on optical properties and quantum weight of monolayer MnBi${}_2$X${}_4$ (X = Te, Se, S)
• Strain-engineering quantum anomalous Hall effect in janus MnBi2SexTe4-x monolayers
• Many-body description of two-dimensional van der Waals ferroelectric $\alpha -$In${}_2$Se${}_3$