Large Exciton Binding Energy in the Bulk van der Waals Magnet CrSBr

Abstract

Excitons, bound electron-hole pairs, influence the optical properties in strongly interacting solid state systems. Excitons and their associated many-body physics are typically most stable and pronounced in monolayer materials. Bulk systems with large exciton binding energies, on the other hand, are rare and the mechanisms driving their stability are still relatively unexplored. Here, we report an exceptionally large exciton binding energy in single crystals of the bulk van der Waals antiferromagnet CrSBr. Utilizing state-of-the-art angle-resolved photoemission spectroscopy and self-consistent ab-initio GW calculations, we present direct spectroscopic evidence that robust electronic and structural anisotropy can significantly amplify the exciton binding energy within bulk crystals. Furthermore, the application of a vertical electric field enables broad tunability of the optical and electronic properties. Our results indicate that CrSBr is a promising material for the study of the role of anisotropy in strongly interacting bulk systems and for the development of exciton-based optoelectronics.

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Cited by in corpus (11)

• Charge Density Wave and Ferromagnetism in Intercalated CrSBr
• Raman Polarization Switching in CrSBr
• Distinct Magneto-Optical Response of Frenkel and Wannier Excitons in CrSBr
• Interplay of energy and charge transfer in WSe2/CrSBr heterostructures
• Surface-Dominated Quantum Metric-Induced Nonlinear Transport in the Layered Antiferromagnet CrSBr
• Magnetic Correlation Spectroscopy in CrSBr
• Twist Engineering of Anisotropic Excitonic and Optical Properties of a Two-Dimensional Magnetic Semiconductor
• Excitons and trions in CrSBr bilayers
• Revealing the Electronic Structure of van der Waals Antiferromagnetic NiPS${}_3$ through Synchrotron-Based $\mu$-ARPES and Alkali Metal Dosing
• Intrinsic defects as a source of $\text{n}$-type conductivity in CrSBr
• Observation of anisotropic dispersive dark exciton dynamics in CrSBr