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Magnetically brightened dark electron-phonon bound states in a van der Waals antiferromagnet
Name
s41467-021-27741-3.pdf
Description
Published version
Size
12.3 MB
Format
Adobe PDF
Checksum (MD5)
5bcaadf894682c2f00455bb815befd3e
Author(s)
Ergeçen, Emre
Ilyas, Batyr
Mao, Dan
Po, Hoi Chun
Yilmaz, Mehmet Burak
Kim, Junghyun
Park, Je-Geun
Senthil, T
Gedik, Nuh
Date Issued
December 2022
Journal
Nature Communications
Publisher
Springer Science and Business Media LLC
Citation
Ergeçen, Emre, Ilyas, Batyr, Mao, Dan, Po, Hoi Chun, Yilmaz, Mehmet Burak et al. 2022. "Magnetically brightened dark electron-phonon bound states in a van der Waals antiferromagnet." Nature Communications, 13 (1).
Version
Final published version
Abstract
AbstractIn van der Waals (vdW) materials, strong coupling between different degrees of freedom can hybridize elementary excitations into bound states with mixed character1–3. Correctly identifying the nature and composition of these bound states is key to understanding their ground state properties and excitation spectra4,5. Here, we use ultrafast spectroscopy to reveal bound states of d-orbitals and phonons in 2D vdW antiferromagnet NiPS3. These bound states manifest themselves through equally spaced phonon replicas in frequency domain. These states are optically dark above the Néel temperature and become accessible with magnetic order. By launching this phonon and spectrally tracking its amplitude, we establish the electronic origin of bound states as localized d–d excitations. Our data directly yield electron-phonon coupling strength which exceeds the highest known value in 2D systems6. These results demonstrate NiPS3 as a platform to study strong interactions between spins, orbitals and lattice, and open pathways to coherent control of 2D magnets.
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Creative Commons Attribution 4.0 International license
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DOI of Published Version
10.1038/s41467-021-27741-3
