Group theory study of the vibrational modes and magnetic order in the topological antiferromagnet MnBi2Te4

  title={Group theory study of the vibrational modes and magnetic order in the topological antiferromagnet 
  author={Martin Rodriguez-Vega and Aritz Leonardo and Gregory A. Fiete},
  journal={Physical Review B},
We employ group theory to study the properties of the lattice vibrations and magnetic order in the antiferromagnetic topological insulator MnBi$_2$Te$_4$, both in bulk and few-layer form. In the paramagnetic phase, we obtain the degeneracies, the selection rules, and real-space displacements for the lattice vibrational modes for different stacking configurations. We discuss how magnetism influences these results. As a representative example, we consider a double septuple layer system and obtain… 
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