Magnetic order induced polarization anomaly of Raman scattering in 2D magnet CrI${}_3$

Abstract

The recent discovery of 2D magnets has revealed various intriguing phenomena due to the coupling between spin and other degree of freedoms (such as helical photoluminescence, nonreciprocal SHG). Previous research on the spin-phonon coupling effect mainly focuses on the renormalization of phonon frequency. Here we demonstrate that the Raman polarization selection rules of optical phonons can be greatly modified by the magnetic ordering in 2D magnet CrI${}_3$. For monolayer samples, the dominant A${}_{1g}$ peak shows abnormally high intensity in the cross polarization channel at low temperature, which is forbidden by the selection rule based on the lattice symmetry. While for bilayer, this peak is absent in the cross polarization channel for the layered antiferromagnetic (AFM) state and reappears when it is tuned to the ferromagnetic (FM) state by an external magnetic field. Our findings shed light on exploring the emergent magneto-optical effects in 2D magnets.

15 pages, 4 figures

References in corpus (8)

• Magnetic 2D materials and heterostructures
• Ising-Type Magnetic Ordering in Atomically Thin FePS3
• Scattering Continuum and Possible Fractionalized Excitations in $\alpha$-RuCl${}_3$
• Suppression of magnetic ordering in XXZ-type antiferromagnetic monolayer NiPS3
• Evolution of interlayer and intralayer magnetism in three atomically thin chromium trihalides
• Antiferromagnetic ordering in van der Waals two-dimensional magnetic material MnPS3 probed by Raman spectroscopy
• Tuning Inelastic Light Scattering via Symmetry Control in 2D Magnet CrI${}_3$
• Stability of exfoliated Bi${}_2$Sr${}_2$Dy${}_x$Ca${}_{1-x}$Cu${}_2$O${}_{8+\delta }$ studied by Raman microscopy

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• Designing magnetic properties in CrSBr through hydrostatic pressure and ligand substitution
• Structural Monoclinicity and Its Coupling to Layered Magnetism in Few-Layer $\mathrm{Cr}{\mathrm{I}}_3$
• On-site and inter-site Hubbard corrections in magnetic monolayers: The case of FePS${}_3$ and CrI${}_3$
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• Observation of intrinsic crystal phase in bare CrI3 ferromagnetism
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• Band Splitting and Long-lived Carrier Recombination in Ferromagnetic CrSiTe3 Nanosheets
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