Magnons and magnetic fluctuations in atomically thin MnBi2Te4

David Lujan, Jeongheon Choe, Martin Rodriguez-Vega (), Zhipeng Ye, Aritz Leonardo, T. Nathan Nunley, Liang-Juan Chang, Shang-Fan Lee, Jiaqiang Yan, Gregory A. Fiete, Rui He () and Xiaoqin Li ()
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David Lujan: The University of Texas at Austin
Jeongheon Choe: The University of Texas at Austin
Martin Rodriguez-Vega: Los Alamos National Laboratory
Zhipeng Ye: Texas Tech University
Aritz Leonardo: Donostia International Physics Center
T. Nathan Nunley: The University of Texas at Austin
Liang-Juan Chang: The University of Texas at Austin
Shang-Fan Lee: Institute of Physics, Academia Sinica
Jiaqiang Yan: Oak Ridge National Laboratory
Gregory A. Fiete: Northeastern University
Rui He: Texas Tech University
Xiaoqin Li: The University of Texas at Austin

Nature Communications, 2022, vol. 13, issue 1, 1-7

Abstract: Abstract Electron band topology is combined with intrinsic magnetic orders in MnBi2Te4, leading to novel quantum phases. Here we investigate collective spin excitations (i.e. magnons) and spin fluctuations in atomically thin MnBi2Te4 flakes using Raman spectroscopy. In a two-septuple layer with non-trivial topology, magnon characteristics evolve as an external magnetic field tunes the ground state through three ordered phases: antiferromagnet, canted antiferromagnet, and ferromagnet. The Raman selection rules are determined by both the crystal symmetry and magnetic order while the magnon energy is determined by different interaction terms. Using non-interacting spin-wave theory, we extract the spin-wave gap at zero magnetic field, an anisotropy energy, and interlayer exchange in bilayers. We also find magnetic fluctuations increase with reduced thickness, which may contribute to a less robust magnetic order in single layers.

Date: 2022
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DOI: 10.1038/s41467-022-29996-w

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