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Coherent many-body exciton in van der Waals antiferromagnet NiPS3

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Title
Coherent many-body exciton in van der Waals antiferromagnet NiPS3
Author(s)
Soonmin Kang; Kangwon Kim; Beom Hyun Kim; Jonghyeon Kim; Kyung Ik Sim; Jae-Ung Lee; Sungmin Lee; Kisoo Park; Seokhwan Yun; Taehun Kim; Abhishek Nag; Andrew Walters; Mirian Garcia-Fernandez; Jiemin Li; Laurent Chapon; Ke-Jin Zhou; Young-Woo Son; Jae Hoon Kim; Hyeonsik Cheong; Je-Geun Park
Subject
THIOPHOSPHATES MPS3 M, ; CONDENSATION, ; FERROMAGNETISM, ; MAGNETISM, ; MN, ; FE
Publication Date
2020-07
Journal
NATURE, v.583, no.7818, pp.785 - 789
Publisher
NATURE PUBLISHING GROUP
Abstract
© 2020, The Author(s), under exclusive licence to Springer Nature Limited. An exciton is the bosonic quasiparticle of electron-hole pairs bound by the Coulomb interaction(1). Bose-Einstein condensation of this exciton state has long been the subject of speculation in various model systems(2,3), and examples have been found more recently in optical lattices and two-dimensional materials(4-9). Unlike these conventional excitons formed from extended Bloch states(4-9), excitonic bound states from intrinsically many-body localized states are rare. Here we show that a spin-orbit-entangled exciton state appears below the Neel temperature of 150 kelvin in NiPS3, an antiferromagnetic van der Waals material. It arises intrinsically from the archetypal many-body states of the Zhang-Rice singlet(10,11), and reaches a coherent state assisted by the antiferromagnetic order. Using configuration-interaction theory, we determine the origin of the coherent excitonic excitation to be a transition from a Zhang-Rice triplet to a Zhang-Rice singlet. We combine three spectroscopic tools-resonant inelastic X-ray scattering, photoluminescence and optical absorption-to characterize the exciton and to demonstrate an extremely narrow excitonic linewidth below 50 kelvin. The discovery of the spin-orbit-entangled exciton in antiferromagnetic NiPS(3)introduces van der Waals magnets as a platform to study coherent many-body excitons. A spin-orbit-entangled exciton state in the van der Waals material NiPS(3)is observed, and found to arise from many-body states of a Zhang-Rice singlet
URI
https://pr.ibs.re.kr/handle/8788114/7741
DOI
10.1038/s41586-020-2520-5
ISSN
0028-0836
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > 1. Journal Papers (저널논문)
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