2022/10/18(Tue)
11:00 -12:00
五樓第一會議室 5F, 1st Meeting Room
視訊演講 Video Seminar [ Meeting Link / ID: 2518 687 1927 / Password: TNbH2JSqs57 ]
Title
High-angular momentum excitations in collinear antiferromagnet FePS3
Speaker
Dr. Milan Orlita (LNCMI-CNRS, Grenoble, France)Abstract
In my talk, I will 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.
Language
演講語言 (Language): in English
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