Dispersive dark excitons in van der Waals ferromagnet CrI3

Abstract

Spin-flip dark excitons are optical-dipole-forbidden quasiparticles with remarkable potential in optoelectronics, especially when they are realized within cleavable van der Waals materials. Despite this potential, dark excitons have not yet been definitively identified in ferromagnetic van der Waals materials. Here, we report two dark excitons in a model ferromagnetic material CrI3 using high-resolution resonant inelastic x-ray scattering (RIXS) and show that they feature narrower linewidths compared to the bright excitons previously reported in this material. These excitons are shown to have spin-flip character, to disperse as a function of momentum, and to change through the ferromagnetic transition temperature. Given the versatility of van der Waals materials, these excitons hold promise for new types of magneto-optical functionality.

6 pages, 4 figures to appear in Physical Review X

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Cited by in corpus (6)

• How to choose efficiently the size of the Bethe-Salpeter Equation Hamiltonian for accurate exciton calculations on supercells
• Resonant X-ray spectroscopies on Chromium $3\text{d}$ orbitals in CrSBr
• Observation of anisotropic dispersive dark exciton dynamics in CrSBr
• Electronic Energy Scales of Cr$X_3$ ($X$ = Cl, Br, and I) using High-resolution X-ray Scattering
• Valence Modifications in Hygroscopic VI3 Degraded Crystals via Soft X-Ray Synchrotron Radiation
• Orbital mixing and strong Hund's coupling stabilize spin order in van der Waals ferromagnet CrI3