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

@article{RodriguezVega2020GroupTS,
  title={Group theory study of the vibrational modes and magnetic order in the topological antiferromagnet 
MnBi2Te4},
  author={Martin Rodriguez-Vega and Aritz Leonardo and Gregory A. Fiete},
  journal={Physical Review B},
  year={2020},
  volume={102},
  pages={104102}
}
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… 
3 Citations
Electron-Phonon and Spin-Lattice Coupling in Atomically Thin Layers of MnBi2Te4.
TLDR
This work investigates how couplings between electron, spin, and lattice are manifested in the phonon spectra of few-septuple-layer thick MnBi2Te4, a new class of magnetic topological insulators in which novel quantum phases emerge at temperatures higher than those found in magnetically doped thin films.
Light-driven topological and magnetic phase transitions in thin-layer antiferromagnets
Martin Rodriguez-Vega, Ze-Xun Lin, 3 A. Leonardo, 5 A. Ernst, 7 M. G. Vergniory, 8 and Gregory A. Fiete 9 Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
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