Members of the group published an article entitled "Probing the Ferromagnetism and Spin Wave Gap in VI3 by Helicity- Resolved Raman Spectroscopy" in Nano letters


In the study of two-dimensional magnets, Raman spectroscopy can also be used as a powerful weapon to study the magnetic phase transition through some indirect phenomena such as spin phonon coupling, structural phase transition and Brillouin zone folding. Recently, Lu Bingbing and others of our group have carried this sharp tool, and have given a new research content of two-dimensional magnet with Raman spectroscopy as the main means and VI3 as the platform. The related achievements are summarized as the article "probing the ferromagnetism and spin wave gap in VI3 by helicity resolved Raman spectroscopy", published on Nano Letters.


Article figures: Raman spectra of the acoustic magnon mode. (a) Schematic of the zone center acoustic magnon mode, which is associated with the in phase precession of spins on two V3+ sublattices. (b) The unpolarized Raman spectrum in the low frequency range taken at 0 T, in which the Raman mode at 18.5 cm−1 is assigned as the acoustic magnon mode, or the spin wave gap. (c) Color plot of the magnetic field-dependent Raman spectra of the acoustic magnon mode from 0 to 9 T, where the Zeeman energy shift can be clearly resolved. (d, e) The Raman spectra of the acoustic magnon mode in both σ+/σ− and σ−/σ+ channels taken at 2 T (d) and −2 T (e), and the insets display the spin direction relative to the lattice. (f) The calculated magnon dispersion of monolayer VI3.


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