Rapid Suppression of Quantum Many-Body Magnetic Exciton in Doped van der Waals Antiferromagnet (Ni,Cd)PS3

Junghyun Kim, Woongki Na, Jonghyeon Kim, Pyeongjae Park, Kaixuan Zhang, Inho Hwang, Young Woo Son, Jae Hoon Kim, Hyeonsik Cheong, Je Geun Park

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

The unique discovery of the magnetic exciton in van der Waals antiferromagnet NiPS3 arises between two quantum many-body states of a Zhang-Rice singlet excited state and a Zhang-Rice triplet ground state. Simultaneously, the spectral width of photoluminescence originating from this exciton is exceedingly narrow as 0.4 meV. These extraordinary properties, including the extreme coherence of the magnetic exciton in NiPS3, beg many questions. We studied doping effects using Ni1-xCdxPS3 using two experimental techniques and theoretical studies. Our experimental results show that the magnetic exciton is drastically suppressed upon a few % Cd doping. All this happens while the width of the exciton only gradually increases and the antiferromagnetic ground state is robust. These results highlight the lattice uniformity’s hidden importance as a prerequisite for coherent magnetic exciton.

Original languageEnglish
Pages (from-to)10189-10195
Number of pages7
JournalNano Letters
Volume23
Issue number22
DOIs
StatePublished - Nov 22 2023
Externally publishedYes

Funding

We acknowledge many helpful and exciting discussions with Youjin Lee and Suhan Son during the project. The works at Seoul National University were supported by the Leading Researcher Program of the National Research Foundation of Korea (Grant No. 2020R1A3B2079375). Works at Sogang University and Yonsei University were supported by the National Research Foundation (NRF) grant funded by the Korean government (MSIT) (2019R1A2C3006189; 2017R1A5A1014862, SRC program: vdWMRC center; 2021R1A2C3004989). Jonghyeon Kim was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (2022R1I1A1A01063982). Young-Woo Son was partially supported by the KIAS individual Grant No. CG031509.

Keywords

  • 2D magnet
  • NiPS
  • magnetic exciton
  • many-body quantum states

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