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Exciton-driven antiferromagnetic metal in a correlated van der Waals insulator
Name
s41467-021-25164-8.pdf
Description
Published version
Size
3.1 MB
Format
Adobe PDF
Checksum (MD5)
13189fe3b175a49b8bbae05db8f6db42
Author(s)
Belvin, Carina A
Baldini, Edoardo
Ozel, Ilkem Ozge
Mao, Dan
Po, Hoi Chun
Allington, Clifford J
Son, Suhan
Kim, Beom Hyun
Kim, Jonghyeon
Hwang, Inho
Date Issued
2021
Journal
Nature Communications
Publisher
Springer Science and Business Media LLC
Citation
Belvin, Carina A, Baldini, Edoardo, Ozel, Ilkem Ozge, Mao, Dan, Po, Hoi Chun et al. 2021. "Exciton-driven antiferromagnetic metal in a correlated van der Waals insulator." Nature Communications, 12 (1).
Version
Final published version
Abstract
AbstractCollective excitations of bound electron-hole pairs—known as excitons—are ubiquitous in condensed matter, emerging in systems as diverse as band semiconductors, molecular crystals, and proteins. Recently, their existence in strongly correlated electron materials has attracted increasing interest due to the excitons’ unique coupling to spin and orbital degrees of freedom. The non-equilibrium driving of such dressed quasiparticles offers a promising platform for realizing unconventional many-body phenomena and phases beyond thermodynamic equilibrium. Here, we achieve this in the van der Waals correlated insulator NiPS3 by photoexciting its newly discovered spin–orbit-entangled excitons that arise from Zhang-Rice states. By monitoring the time evolution of the terahertz conductivity, we observe the coexistence of itinerant carriers produced by exciton dissociation and a long-wavelength antiferromagnetic magnon that coherently precesses in time. These results demonstrate the emergence of a transient metallic state that preserves long-range antiferromagnetism, a phase that cannot be reached by simply tuning the temperature. More broadly, our findings open an avenue toward the exciton-mediated optical manipulation of magnetism.
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Creative Commons Attribution 4.0 International license
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DOI of Published Version
10.1038/S41467-021-25164-8
