High-Angular Momentum Excitations in Collinear Antiferromagnet FePS3
Nano letters(2022)
摘要
We report on magneto-optical studies of the quasi-two-dimensional van der Waals antiferromagnet FePS3. Our measurements reveal an excitation that closely resembles the antiferromagnetic resonance mode typical of easy-axis antiferromagnets; nevertheless, it displays an unusual, four-times larger Zeeman splitting in an applied magnetic field. We identify this excitation with an |Sz| = 4 multipolar magnon─a single-ion 4-magnon bound state─that corresponds to a full reversal of a single magnetic moment of the Fe2+ ion. We argue that condensation of multipolar magnons in large-spin materials with a strong magnetic anisotropy can produce new exotic states.
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关键词
Magnon,THz,infrared magneto-spectroscopy,2D antiferromagnets,van der Waals materials,antiferromagnetic resonance
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