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Yang, Bowen ; Goh, Yin Min ; Sung, Suk Hyun ; Ye, Gaihua ; Biswas, Sananda ; Kaib, David A. ; Dhakal, Ramesh ; Yan, Shaohua ; Li, Chenghe ; Jiang, Shengwei ; et al ( , Nature Materials)
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Lujan, David ; Choe, Jeongheon ; Rodriguez-Vega, Martin ; Ye, Zhipeng ; Leonardo, Aritz ; Nunley, T. Nathan ; Chang, Liang-Juan ; Lee, Shang-Fan ; Yan, Jiaqiang ; Fiete, Gregory A. ; et al ( , Nature Communications)Abstract Electron band topology is combined with intrinsic magnetic orders in MnBi 2 Te 4 , leading to novel quantum phases. Here we investigate collective spin excitations (i.e. magnons) and spin fluctuations in atomically thin MnBi 2 Te 4 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.more » « less