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Evidence for ground state coherence in a two-dimensional Kondo lattice

Author

Listed:
  • Wen Wan

    (Donostia International Physics Center (DIPC), Paseo Manuel de Lardizábal 4
    Shanghai University)

  • Rishav Harsh

    (Donostia International Physics Center (DIPC), Paseo Manuel de Lardizábal 4)

  • Antonella Meninno

    (Centro de Física de Materiales (CSIC-UPV/EHU), Paseo Manuel de Lardizábal 5
    University of the Basque Country (UPV/EHU))

  • Paul Dreher

    (Donostia International Physics Center (DIPC), Paseo Manuel de Lardizábal 4)

  • Sandra Sajan

    (Donostia International Physics Center (DIPC), Paseo Manuel de Lardizábal 4)

  • Haojie Guo

    (Donostia International Physics Center (DIPC), Paseo Manuel de Lardizábal 4)

  • Ion Errea

    (Donostia International Physics Center (DIPC), Paseo Manuel de Lardizábal 4
    Centro de Física de Materiales (CSIC-UPV/EHU), Paseo Manuel de Lardizábal 5
    University of the Basque Country (UPV/EHU))

  • Fernando Juan

    (Donostia International Physics Center (DIPC), Paseo Manuel de Lardizábal 4
    Ikerbasque, Basque Foundation for Science)

  • Miguel M. Ugeda

    (Donostia International Physics Center (DIPC), Paseo Manuel de Lardizábal 4
    Centro de Física de Materiales (CSIC-UPV/EHU), Paseo Manuel de Lardizábal 5
    Ikerbasque, Basque Foundation for Science)

Abstract

Kondo lattices are ideal testbeds for the exploration of heavy-fermion quantum phases of matter. While our understanding of Kondo lattices has traditionally relied on complex bulk f-electron systems, transition metal dichalcogenide heterobilayers have recently emerged as simple, accessible and tunable 2D Kondo lattice platforms where, however, their ground state remains to be established. Here we present evidence of a coherent ground state in the 1T/1H-TaSe2 heterobilayer by means of scanning tunneling microscopy/spectroscopy at 340 mK. Our measurements reveal the existence of two symmetric electronic resonances around the Fermi energy, a hallmark of coherence in the spin lattice. Spectroscopic imaging locates both resonances at the central Ta atom of the charge density wave of the 1T phase, where the localized magnetic moment is held. Furthermore, the evolution of the electronic structure with the magnetic field reveals a non-linear increase of the energy separation between the electronic resonances. Aided by ab initio and auxiliary-fermion mean-field calculations, we demonstrate that this behavior is inconsistent with a fully screened Kondo lattice, and suggests a ground state with magnetic order mediated by conduction electrons. The manifestation of magnetic coherence in TMD-based 2D Kondo lattices enables the exploration of magnetic quantum criticality, Kondo breakdown transitions and unconventional superconductivity in the strict two-dimensional limit.

Suggested Citation

  • Wen Wan & Rishav Harsh & Antonella Meninno & Paul Dreher & Sandra Sajan & Haojie Guo & Ion Errea & Fernando Juan & Miguel M. Ugeda, 2023. "Evidence for ground state coherence in a two-dimensional Kondo lattice," Nature Communications, Nature, vol. 14(1), pages 1-8, December.
  • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-42803-4
    DOI: 10.1038/s41467-023-42803-4
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    References listed on IDEAS

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    1. Shiwei Shen & Chenhaoping Wen & Pengfei Kong & Jingjing Gao & Jianguo Si & Xuan Luo & Wenjian Lu & Yuping Sun & Gang Chen & Shichao Yan, 2022. "Inducing and tuning Kondo screening in a narrow-electronic-band system," Nature Communications, Nature, vol. 13(1), pages 1-7, December.
    2. Pegor Aynajian & Eduardo H. da Silva Neto & András Gyenis & Ryan E. Baumbach & J. D. Thompson & Zachary Fisk & Eric D. Bauer & Ali Yazdani, 2012. "Visualizing heavy fermions emerging in a quantum critical Kondo lattice," Nature, Nature, vol. 486(7402), pages 201-206, June.
    3. Marcelo Jaime & Roman Movshovich & Gregory R. Stewart & Ward P. Beyermann & Mariano Gomez Berisso & Michael F. Hundley & Paul C. Canfield & John L. Sarrao, 2000. "Closing the spin gap in the Kondo insulator Ce3Bi4Pt3 at high magnetic fields," Nature, Nature, vol. 405(6783), pages 160-163, May.
    4. S. Ernst & S. Kirchner & C. Krellner & C. Geibel & G. Zwicknagl & F. Steglich & S. Wirth, 2011. "Emerging local Kondo screening and spatial coherence in the heavy-fermion metal YbRh2Si2," Nature, Nature, vol. 474(7351), pages 362-366, June.
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    Cited by:

    1. Lorenzo Crippa & Hyeonhu Bae & Paul Wunderlich & Igor I. Mazin & Binghai Yan & Giorgio Sangiovanni & Tim Wehling & Roser Valentí, 2024. "Heavy fermions vs doped Mott physics in heterogeneous Ta-dichalcogenide bilayers," Nature Communications, Nature, vol. 15(1), pages 1-8, December.

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