Tunable Hetero‐Intercalated 2D Superlattice for Frustrated Kondo Triangles

With the successes of van der Waals heterostructures in unveiling exotic quantum states and enabling applications, direct fabrication of 2D superlattices beyond bulk limits is appealing. We realize an unprecedented 2D Kondo superlattice, Ta-NbS<sub>2</sub>, consisting of two coupled metallic 1H-NbS<sub>2</sub> monolayers intercalated with growth-controlled periodic Ta sublattices. One-step CVD enables tunable periodicities, yielding three Ta-moment motifs: bulk-like simple triangular geometry of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:semantics> <mml:mrow><mml:msqrt><mml:mn>3</mml:mn></mml:msqrt> <mml:mspace></mml:mspace></mml:mrow> <mml:annotation>$\sqrt 3\! $</mml:annotation></mml:semantics> </mml:math> a× <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:semantics> <mml:mrow><mml:msqrt><mml:mn>3</mml:mn></mml:msqrt> <mml:mspace></mml:mspace></mml:mrow> <mml:annotation>$\sqrt 3\! $</mml:annotation></mml:semantics> </mml:math> a (Type I), 2D spin-frustrated 4a×4a (Type II), and 2D saturated <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:semantics><mml:mrow><mml:mn>3</mml:mn> <mml:msqrt><mml:mn>3</mml:mn></mml:msqrt> <mml:mspace></mml:mspace></mml:mrow> <mml:annotation>$3\sqrt 3\! $</mml:annotation></mml:semantics> </mml:math> a× <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:semantics><mml:mrow><mml:mn>3</mml:mn> <mml:msqrt><mml:mn>3</mml:mn></mml:msqrt> <mml:mspace></mml:mspace></mml:mrow> <mml:annotation>$3\sqrt 3\! $</mml:annotation></mml:semantics> </mml:math> a (Type III). Beyond the logarithmic resistance upturn at Kondo temperature (T<sub>K</sub>), we observe anomalous Hall effect evolution from single-impurity to coherent Kondo regimes, reflecting collective Ta-Kondo sublattice interactions. Carrier density modulation tunes the balance between Kondo screening and RKKY interactions, establishing 2D bilayer Ta-NbS<sub>2</sub> as an ultra-tunable 2D Kondo superlattice for correlated quantum phenomena, with potential applications in spintronics and quantum devices.

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Journal
Advanced Materials
Published
2026-01-16
DOI
https://doi.org/10.1002/adma.202520751
Primary Topic
Quantum and electron transport phenomena
Type
article
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article

Tunable Hetero‐Intercalated 2D Superlattice for Frustrated Kondo Triangles

Kangdi Niu, Xinxi Liu, Geyang Wang, Daiyue Li et al.
Advanced Materials
Quantum and electron transport phenomena
article

Tunable Hetero‐Intercalated 2D Superlattice for Frustrated Kondo Triangles

Kangdi Niu, Xinxi Liu, Geyang Wang, Daiyue Li, Zenglong Guo, Yi Zheng, Xizhi Fu, Junwei Liu, Ruizi Zhang, Shixuan Du, Jinbo Pan, Junhao Lin, Xiangyu Hu
article en

Abstract

With the successes of van der Waals heterostructures in unveiling exotic quantum states and enabling applications, direct fabrication of 2D superlattices beyond bulk limits is appealing. We realize an unprecedented 2D Kondo superlattice, Ta-NbS<sub>2</sub>, consisting of two coupled metallic 1H-NbS<sub>2</sub> monolayers intercalated with growth-controlled periodic Ta sublattices. One-step CVD enables tunable periodicities, yielding three Ta-moment motifs: bulk-like simple triangular geometry of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:semantics> <mml:mrow><mml:msqrt><mml:mn>3</mml:mn></mml:msqrt> <mml:mspace></mml:mspace></mml:mrow> <mml:annotation>$\sqrt 3\! $</mml:annotation></mml:semantics> </mml:math> a× <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:semantics> <mml:mrow><mml:msqrt><mml:mn>3</mml:mn></mml:msqrt> <mml:mspace></mml:mspace></mml:mrow> <mml:annotation>$\sqrt 3\! $</mml:annotation></mml:semantics> </mml:math> a (Type I), 2D spin-frustrated 4a×4a (Type II), and 2D saturated <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:semantics><mml:mrow><mml:mn>3</mml:mn> <mml:msqrt><mml:mn>3</mml:mn></mml:msqrt> <mml:mspace></mml:mspace></mml:mrow> <mml:annotation>$3\sqrt 3\! $</mml:annotation></mml:semantics> </mml:math> a× <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:semantics><mml:mrow><mml:mn>3</mml:mn> <mml:msqrt><mml:mn>3</mml:mn></mml:msqrt> <mml:mspace></mml:mspace></mml:mrow> <mml:annotation>$3\sqrt 3\! $</mml:annotation></mml:semantics> </mml:math> a (Type III). Beyond the logarithmic resistance upturn at Kondo temperature (T<sub>K</sub>), we observe anomalous Hall effect evolution from single-impurity to coherent Kondo regimes, reflecting collective Ta-Kondo sublattice interactions. Carrier density modulation tunes the balance between Kondo screening and RKKY interactions, establishing 2D bilayer Ta-NbS<sub>2</sub> as an ultra-tunable 2D Kondo superlattice for correlated quantum phenomena, with potential applications in spintronics and quantum devices.

Advanced MaterialsVol. 38(12)
Hong Kong University of Science and Technology (HK), Southern University of Science and Technology (CN), Shenzhen Bay Laboratory (CN), Institute of Physics (CN), University of Chinese Academy of Sciences (CN), Zhejiang University (CN), University of Hong Kong (HK)
Openalex Percentile: Top 83%
Quantum and electron transport phenomena
DOISourceOpenAlex
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