Coherent many-body exciton in van der Waals antiferromagnet NiPS3.

Nature
Soonmin KangJe-Geun Park

Abstract

An exciton is the bosonic quasiparticle of electron-hole pairs bound by the Coulomb interaction1. Bose-Einstein condensation of this exciton state has long been the subject of speculation in various model systems2,3, and examples have been found more recently in optical lattices and two-dimensional materials4-9. Unlike these conventional excitons formed from extended Bloch states4-9, excitonic bound states from intrinsically many-body localized states are rare. Here we show that a spin-orbit-entangled exciton state appears below the Néel 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 singlet10,11, 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 antiferromagneti...Continue Reading

References

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Nov 2, 2018·Nature·Kenneth S BurchJe-Geun Park
Jan 22, 2019·Nature Communications·Kangwon KimHyeonsik Cheong

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Citations

Feb 18, 2021·ACS Nano·Dmytro D YaremkevichManfred Bayer
Feb 25, 2021·Physical Chemistry Chemical Physics : PCCP·Hanxing ZhangXianlong Wang
Jun 4, 2021·Science Advances·Dmytro AfanasievAndrea D Caviglia
Aug 12, 2021·Nature Communications·Carina A BelvinNuh Gedik
Sep 22, 2021·Nanoscale·Xiangru KongLiangbo Liang
Oct 7, 2021·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Chaebin KimJe-Geun Park
Sep 14, 2021·Science Advances·Tiancheng SongXiaodong Xu

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Methods Mentioned

BETA
AFM
X-ray
atomic force microscopy

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