Doping-control of excitons and magnetism in few-layer CrSBr

Abstract

Magnetism in two-dimensional materials reveals phenomena distinct from bulk magnetic crystals, with sensitivity to charge doping and electric fields in monolayer and bilayer van der Waals magnet CrI3. Within the class of layered magnets, semiconducting CrSBr stands out by featuring stability under ambient conditions, correlating excitons with magnetic order and thus providing strong magnon-exciton coupling, and exhibiting peculiar magneto-optics of exciton-polaritons. Here, we demonstrate that both exciton and magnetic transitions in bilayer and trilayer CrSBr are sensitive to voltage-controlled field-effect charging, exhibiting bound exciton-charge complexes and doping-induced metamagnetic transitions. Moreover, we demonstrate how these unique properties enable optical probes of local magnetic order, visualizing magnetic domains of competing phases across metamagnetic transitions induced by magnetic field or electrostatic doping. Our work identifies few-layer CrSBr as a rich platform for exploring collaborative effects of charge, optical excitations, and magnetism.

arXiv comment18 pages, 11 figures

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• Roadmap for Photonics with 2D Materials
• Large Exciton Binding Energy in the Bulk van der Waals Magnet CrSBr
• Raman Polarization Switching in CrSBr
• Spin-chirality-driven second-harmonic generation in two-dimensional magnet CrSBr
• Imaging strain-controlled magnetic reversal in thin CrSBr
• Surface-Dominated Quantum Metric-Induced Nonlinear Transport in the Layered Antiferromagnet CrSBr
• Tunable Nanophotonic Devices and Cavities based on a Two-Dimensional Magnet
• Twist Engineering of Anisotropic Excitonic and Optical Properties of a Two-Dimensional Magnetic Semiconductor
• Magnetic Correlation Spectroscopy in CrSBr
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• Boltzmann transport theory of magnon-exciton drag
• Space-Charge-Limited van der Waals Spin Transistor
• Magneto-Excitonic Duality From Monolayer to Trilayer CrSBr
• Terahertz radiation induced attractive-repulsive Fermi polaron conversion in transition metal dichalcogenide monolayers
• Long-Lived Interlayer Excitons and Type-II Band Alignment in Janus MoTe2/CrSBr van der Waals Heterostructures