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Exciton-driven antiferromagnetic metal in a correlated van der Waals insulator

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Title
Exciton-driven antiferromagnetic metal in a correlated van der Waals insulator
Author(s)
Belvin, Carina A.; Baldini, Edoardo; Ozel, Ilkem Ozge; Mao, Dan; Po, Hoi Chun; Allington, Clifford J.; Suhan Son; Kim, Beom Hyun; Kim, Jonghyeon; Inho Hwang; Kim, Jae Hoon; Je-Geun Park; Senthil, T.; Gedik, Nuh
Subject
PHOTOCONDUCTIVITY, ; TRANSIENT
Publication Date
2021-08-10
Journal
NATURE COMMUNICATIONS, v.12, no.1
Publisher
Nature Research
Abstract
© 2021, The Author(s).Collective 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.
URI
https://pr.ibs.re.kr/handle/8788114/10177
DOI
10.1038/s41467-021-25164-8
ISSN
2041-1723
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > 1. Journal Papers (저널논문)
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