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Ultrafast Exciton Dynamics in the Atomically Thin van der Waals Magnet CrSBr. | LitMetric

AI Article Synopsis

  • CrSBr, an atomically thin semiconductor, features tightly bound excitons in both its bulk and monolayer forms, making it significant for solid-state research.
  • The study utilizes terahertz polarization spectroscopy combined with near-field microscopy to measure the exciton lifetime in a monolayer of CrSBr, finding it to be 30 times shorter than in bulk form.
  • The findings reveal low-energy signatures of electron-hole pairs and provide a new understanding of the ultrafast dielectric response of excitons, which could help in the development of quantum devices using ultrathin van der Waals magnets.

Article Abstract

Among atomically thin semiconductors, CrSBr stands out as both its bulk and monolayer forms host tightly bound, quasi-one-dimensional excitons in a magnetic environment. Despite its pivotal importance for solid-state research, the exciton lifetime has remained unknown. While terahertz polarization probing can directly trace all excitons, independently of interband selection rules, the corresponding large far-field foci substantially exceed the lateral sample dimensions. Here, we combine terahertz polarization spectroscopy with near-field microscopy to reveal a femtosecond decay of paramagnetic excitons in a monolayer of CrSBr, which is 30 times shorter than the bulk lifetime. We unveil low-energy fingerprints of bound and unbound electron-hole pairs in bulk CrSBr and extract the nonequilibrium dielectric function of the monolayer in a model-free manner. Our results demonstrate the first direct access to the ultrafast dielectric response of quasi-one-dimensional excitons in CrSBr, potentially advancing the development of quantum devices based on ultrathin van der Waals magnets.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11010225PMC
http://dx.doi.org/10.1021/acs.nanolett.3c05010DOI Listing

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