Sensing the local magnetic environment through optically active defects in a layered magnetic semiconductor

Abstract

Atomic-level defects in van der Waals (vdW) materials are essential building blocks for quantum technologies and quantum sensing applications. The layered magnetic semiconductor CrSBr is an outstanding candidate for exploring optically active defects owing to a direct gap in addition to a rich magnetic phase diagram including a recently hypothesized defect-induced magnetic order at low temperature. Here, we show optically active defects in CrSBr that are probes of the local magnetic environment. We observe spectrally narrow (1 meV) defect emission in CrSBr that is correlated with both the bulk magnetic order and an additional low temperature defect-induced magnetic order. We elucidate the origin of this magnetic order in the context of local and non-local exchange coupling effects. Our work establishes vdW magnets like CrSBr as an exceptional platform to optically study defects that are correlated with the magnetic lattice. We anticipate that controlled defect creation allows for tailor-made complex magnetic textures and phases with the unique ingredient of direct optical access.

main: 12 pages, 5 figures; SI: 14 pages, 11 figures

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Cited by in corpus (21)

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• 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
• Magnon-mediated exciton-exciton interaction in a van der Waals antiferromagnet
• Charge transfer and asymmetric coupling of MoSe${}_2$ valleys to the magnetic order of CrSBr
• Magneto-optical sensing of the pressure driven magnetic ground states in bulk CrSBr
• Ferromagnetic interlayer coupling in CrSBr crystals irradiated by ions
• Intrinsic magnetic properties of the layered antiferromagnet CrSBr
• Local Fluctuations in Cavity Control of Ferroelectricity
• Enhanced Ferromagnetism in Monolayer Cr2Te3 via Topological Insulator Coupling
• Probing the Berezinskii-Kosterlitz-Thouless vortex unbinding transition in two-dimensional superconductors using local noise magnetometry
• Interplay of energy and charge transfer in WSe2/CrSBr heterostructures
• Defect complexes in CrSBr revealed through electron microscopy and deep learning
• Directional Flow of Confined Polaritons in CrSBr
• Magnon sensing of NO, NO${}_2$ and NH${}_3$ gas capture on CrSBr monolayer
• Intrinsic defects as a source of $\text{n}$-type conductivity in CrSBr
• Magneto-Excitonic Duality From Monolayer to Trilayer CrSBr
• Excitonic optical absorption in strained monolayer CrSBr
• Giant-exchange-driven Vectorial Control of a Minimal Topological Magnet in Eu3In2As4