Infrared study of the layered, magnetic insulator Mn(Bi${}_{0.07}$Sb${}_{0.93}$)${}_2$Te${}_4$ at low temperatures

Abstract

Topological insulators with intrinsic magnetic ordering, potentially hosting rare quantum effects, recently attracted extensive attention. MnBi${}_2$Te${}_4$ is the first established example. The Sb-doped variant Mn(Bi${}_{1-x}$Sb${}_x$)${}_2$Te${}_4$ shows a great variety of electronic properties depending on the Sb content~$x$, such as shifts in the Fermi level and the Neel temperature $T_{\mathrm{N}}$, and the change of the free charge carrier type from $n$- to $p$-type at high Sb substitution ratios. Here, we investigate the effect of magnetic ordering on the bulk electronic structure of Mn(Bi${}_{1-x}$Sb${}_x$)${}_2$Te${}_4$ with high Sb content $x=0.93$ by temperature-dependent reflectivity measurements over a broad frequency range. We observe anomalies in the optical response across $T_{\mathrm{N}}$ when the antiferromagnetic order sets, which suggests a coupling between the magnetic ordering and the electronic structure of the material.

7 pages, 4 figures

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• Realizing gapped surface states in magnetic topological insulator MnBi${}_{2-x}$Sb${}_x$Te${}_4$
• Gate-Tunable Quantum Anomalous Hall Effects in MnBi${}_2$Te${}_4$ Thin Films
• Infrared study of the multiband low-energy excitations of the topological antiferromagnet MnBi${}_2$Te${}_4$
• Influence of magnetic ordering on the optical response of the antiferromagnetic topological insulator MnBi${}_2$Te${}_4$
• Infrared study of the interplay of charge, spin, and lattice excitations in the magnetic topological insulator EuIn${}_2$As${}_2$
• Intermediate anomalous Hall states induced by noncollinear spin structure in magnetic topological insulator MnBi2Te4

Cited by in corpus (4)

• Crystal structure and Raman active lattice vibrations of magnetic topological insulators MnBi2Te4 n(Bi2Te3) (n = 0, 1, . . . , 6)
• Optical study of the charge dynamics evolution in the topological insulators MnBi${}_2$Te${}_4$ and Mn(Bi${}_{0.74}$Sb${}_{0.26}$)${}_2$Te${}_4$ under high pressure
• Evolution of the optical response of the magnetic topological insulators Mn(Bi${}_{1-x}$Sb${}_x$)${}_2$Te${}_4$ with Sb content
• Optical conductivity of the metallic pyrochlore iridate Pr${}_2$Ir${}_2$O${}_7$: Influence of spin-orbit coupling and electronic correlations on the electronic structure