Dynamical properties of magnetic topological insulator $T$Bi${}_2$Te${}_4$ ($T=$Mn, Fe): phonons dispersion, Raman active modes, and chiral phonons study

Abstract

Recently discovered magnetic topological insulators $T$Bi${}_2$Te${}_4$ ($T=$Mn, Fe) crystallize into the $R\bar{3}m$ rhombohedral structure and exhibit the antiferromagnetic order. Here, we discuss the lattice dynamics of these compounds to confirm the stability of these systems. We show that the phonon dispersion does not contain soft modes, so both compounds are dynamically stable in the $R\bar{3}m$ phase. We perform theoretical analyses of the mode activity at $\Gamma$ point for the discussed compounds. In the case of the Raman active modes, our results are in agreement with the experimentally observed frequencies. Finally, we also discuss the possibility of realization of chiral phonons.

8 pages, 4 figures

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Cited by in corpus (11)

• Two-dimensional THz spectroscopy of nonlinear phononics in the topological insulator ${\mathrm{MnBi}}_2{\mathrm{Te}}_4$
• Crystal structure and Raman active lattice vibrations of magnetic topological insulators MnBi2Te4 n(Bi2Te3) (n = 0, 1, . . . , 6)
• Multimechanism quantum anomalous Hall and Chern number tunable states in germanene (silicene, stanene)/$M$Bi${}_2$Te${}_4$ heterostructures
• Novel magnetic topological insulator FeBi${}_2$Te${}_4$ with controllable topological quantum phase
• Universally optimizable strategy for magnetic gaps towards high-temperature quantum anomalous Hall states via magnetic-insulator/topological-insulator building-blocks
• Chiral phonons in binary compounds $A$Bi ($A$ = K, Rb, Cs) with P2${}_1$/c structure
• $T_3$Pb${}_{2}C{h}_2$ ($T$=Pd,Pt and $Ch$=S,Se) with transition metal kagome net: Dynamical properties, phonon nodal line, phonon surface states, and chiral phonons
• Coexistent topological and chiral phonons in chiral RhGe: An ab initio study
• Correlation stabilized ferromagnetic MnRuAs with distorted kagome lattice
• Chiral phonon in the cubic system based on the Laves phase of $A$Bi${}_2$ ($A=$K, Rb, Cs)
• Anisotropic electron-phonon coupling and chiral phonons in van der Waals room temperature ferromagnet Fe${}_5$GeTe${}_2$