Journal
NANO LETTERS
Volume 20, Issue 8, Pages 6024-6031Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.0c02029
Keywords
2D magnets; helicity-resolved Raman spectroscopy; VI3; magnon; magneto-optical effect
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Funding
- Science, Technology and Innovation Commission of Shenzhen Municipality [JCYJ20170412152334605, JCYJ201708171051-32549, JCYJ20180504165817769]
- Initiative Funds for Shenzhen High Class University [G02206301]
- National Natural Science Foundation of China [11774142]
- Center for Computational Science and Engineering of Southern University of Science and Technology
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Circularly polarized light carries light spin angular momentum, which may lead helicity-resolved Raman scattering to be sensitive to the electronic spin configuration in magnetic materials. Here, we demonstrate that all Raman modes in the 2D ferromagnet VI3 show different scattering intensities to left and right circularly polarized light at low temperatures, which gives direct evidence of the time-reversal symmetry breaking. By measuring the circular polarization of the dominant Raman mode with respect to the temperature and magnetic field, the ferromagnetic (FM) phase transition and hysteresis behavior can be clearly resolved. Besides the lattice excitations, quasielastic scattering is detected in the paramagnetic phase, and it gradually evolves into the acoustic magnon mode at 18.5 cm(-1) in the FM state, which gives the spin wave gap that results from large magnetic anisotropy. Our findings demonstrate that helicity-resolved Raman spectroscopy is an effective tool to directly probe the ferromagnetism in 2D magnets.
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