Meineke, Christian and Schlosser, Jakob and Zizlsperger, Martin and Liebich, Marlene and Nilforoushan, Niloufar and Mosina, Kseniia and Terres, Sophia and Chernikov, Alexey and Sofer, Zdenek and Huber, Markus A. and Florian, Matthias and Kira, Mackillo and Dirnberger, Florian and Huber, Rupert (2024) Ultrafast Exciton Dynamics in the Atomically Thin van der Waals Magnet CrSBr. NANO LETTERS, 24 (14). pp. 4101-4107. ISSN 1530-6984, 1530-6992
Full text not available from this repository. (Request a copy)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.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | POLARITONS; atomically thin solids; van der Waals magnets; anisotropic excitons; ultrafastdynamics; femtosecondnear-field microscopy; terahertz |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Chair Professor Huber > Group Rupert Huber |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 15 Sep 2025 09:31 |
| Last Modified: | 15 Sep 2025 09:31 |
| URI: | https://pred.uni-regensburg.de/id/eprint/64197 |
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