Raman Polarization Switching in CrSBr

Abstract

Semiconducting CrSBr is a layered A-type antiferromagnet, with individual layers antiferromagnetically coupled along the stacking direction. Due to its unique orthorhombic crystal structure, CrSBr exhibits highly anisotropic mechanical and optoelectronic properties acting itself as a quasi-1D material. CrSBr demonstrates complex coupling phenomena involving phonons, excitons, magnons, and polaritons. Here we show through polarization-resolved resonant Raman scattering the intricate interaction between the vibrational and electronic properties of CrSBr. For samples spanning from few-layer to bulk thickness, we observe that the polarization of the A${}_g^2$ Raman mode can be rotated by 90 degrees, shifting from alignment with the crystallographic a (intermediate magnetic) axis to the b (easy magnetic) axis, depending on the excitation energy. In contrast, the A${}_g^1$ and A${}_g^3$ modes consistently remain polarized along the b axis, regardless of the laser energy used. We access real and imaginary parts of the Raman tensor in our analysis, uncovering resonant electron-phonon coupling.

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References in corpus (27)

• The Raman Fingerprint of Graphene
• Layer-dependent Ferromagnetism in a van der Waals Crystal down to the Monolayer Limit
• Discovery of intrinsic ferromagnetism in 2D van der Waals crystals
• Magnetic 2D materials and heterostructures
• Electrical Control of 2D Magnetism in Bilayer CrI3
• Phonon and Raman scattering of two-dimensional transition metal dichalcogenides from monolayer, multilayer to bulk material
• On the origin of magnetic anisotropy in two dimensional CrI${}_3$
• Shear and Layer Breathing Modes in Multilayer MoS2
• Layered Antiferromagnetism Induces Large Negative Magnetoresistance in the van der Waals Semiconductor CrSBr
• Anomalous polarization dependence of Raman scattering and crystallographic orientation of black phosphorus
• Magneto-optics in a van der Waals magnet tuned by self-hybridized polaritons
• The bulk van der Waals layered magnet CrSBr is a quasi-1D material
• Atomistic spin textures on-demand in the van der Waals layered magnet CrSBr
• Tuning the Fröhlich exciton-phonon scattering in monolayer MoS2
• Guide to optical spectroscopy of layered semiconductors
• Probing defects and spin-phonon coupling in CrSBr via resonant Raman scattering
• Doping-control of excitons and magnetism in few-layer CrSBr
• Strong Exciton-Phonon Coupling as a Fingerprint of Magnetic Ordering in van der Waals Layered CrSBr
• Raman scattering signatures of the strong spin-phonon coupling in the bulk magnetic van der Waals material CrSBr
• Paramagnetic Electronic Structure of CrSBr: Comparison between Ab Initio GW Theory and Angle-Resolved Photoemission Spectroscopy
• Large Exciton Binding Energy in the Bulk van der Waals Magnet CrSBr
• Giant exchange splitting in the electronic structure of A-type 2D antiferromagnet CrSBr
• Anisotropic Electron-Hole Excitation and Large Linear Dichroism in Two-Dimensional Ferromagnet CrSBr with In-Plane Magnetization
• Charge transfer-induced Lifshitz transition and magnetic symmetry breaking in ultrathin CrSBr crystals
• Anisotropic Electron-Photon-Phonon Coupling in Layered MoS2
• Colossal magneto-excitonic effects in 2D van der Waals magnetic semiconductor CrSBr
• Two dimensional semiconductors: optical and electronic properties

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