Nature of the Unconventional Heavy-Fermion Kondo State in Monolayer CeSiI

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CeSiI has been recently isolated in the ultrathin limit, establishing CeSiI as the first intrinsic two-dimensional van der Waals heavy-fermion material up to 85 K. We show that, due to the strong spin–orbit coupling, the local moments develop a multipolar real-space magnetic texture, leading to local pseudospins with a nearly vanishing net moment. To elucidate its Kondo-screened regime, we extract from first-principles the parameters of the Kondo lattice model describing this material. We develop a pseudofermion methodology in combination with ab initio calculations to reveal the nature of the heavy-fermion state in CeSiI. We analyze the competing magnetic interactions leading to an unconventional heavy-fermion order as a function of the magnetic exchange between the localized f-electrons and the strength of the Kondo coupling. Our results show that the magnetic exchange interactions promote an unconventional momentum-dependent Kondo-screened phase, establishing the nature of the heavy-fermion state observed in CeSiI.
Original languageEnglish
Pages (from-to)4272-4278
Number of pages7
JournalNano Letters
Issue number14
Early online date23 Feb 2024
Publication statusPublished - 10 Apr 2024
MoE publication typeA1 Journal article-refereed


  • quantum magnetism
  • van der Waals materials
  • 2D materials
  • heavy-fermion materials
  • Kondo lattice
  • ab initio methods


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