Nature of the unconventional heavy fermion Kondo state in monolayer CeSiI

Abstract

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 Ce 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 fractional pseudofermion methodology in combination with ab initio calculations to reveal the nature of the Kondo-screened heavy fermion state in CeSiI. Using this formalism, we analyze the competing magnetic interactions leading to a 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 heavy-fermion Kondo screened phase, establishing the nature of the heavy-fermion behavior of ultrathin CeSiI observed experimentally.

8 pages, 4 figures

References in corpus (25)

• Observation of Fractionally Quantized Anomalous Hall Effect
• Heavy Fermions and Quantum Phase Transitions
• Evidence for a single-layer van der Waals multiferroic
• MATBG as Topological Heavy Fermion: I. Exact Mapping and Correlated Insulators
• Rotational Symmetry Breaking in the Hidden-Order Phase of URu2Si2
• Frustration and the Kondo effect in heavy fermion materials
• Imaging spinon density modulations in a 2D quantum spin liquid
• Gate-tunable heavy fermions in a moiré Kondo lattice
• Emulating heavy fermions in twisted trilayer graphene
• Characteristic signatures of quantum criticality driven by geometrical frustration
• Hidden order and beyond: an experimental-theoretical overview of the multifaceted behavior of URu${}_2$Si${}_2$
• Atomic-scale visualization of multiferroicity in monolayer NiI${}_2$
• Evidence for a spinon Kondo effect in cobalt atoms on single-layer 1T-TaSe${}_2$
• Chiral Kondo Lattice in Doped MoTe${}_2$/WSe${}_2$ Bilayers
• Gate-tunable heavy fermion quantum criticality in a moiré Kondo lattice
• The Missing Link: Magnetism and Superconductivity
• Direct observation of quasi-particle band in CeIrIn${}_5$: Angle-resolved photoemission spectroscopy study
• The electronic structure of CeCoIn5 from angle-resolved photoemission spectroscopy II: Hybridization effects
• Evidence of nodal superconductivity in monolayer 1H-TaS${}_2$ with hidden order fluctuations
• Angle dependent quasiparticle weights in correlated metals
• Magnetic frustration in a van der Waals metal CeSiI
• Inhomogeneous Kondo-lattice in geometrically frustrated Pr${}_2$Ir${}_2$O${}_7$
• Evidence of momentum dependent hybridization in Ce2Co0.8Si3.2
• Photoemission signature of momentum-dependent hybridization in CeCoIn${}_5$
• Emergence of ferromagnetism at the onset of moiré Kondo breakdown

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