Evidence for ground state coherence in a two-dimensional Kondo lattice
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...
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2023-11-01
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| Series: | Nature Communications |
| Online Access: | https://doi.org/10.1038/s41467-023-42803-4 |
| _version_ | 1797636786222006272 |
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| author | Wen Wan Rishav Harsh Antonella Meninno Paul Dreher Sandra Sajan Haojie Guo Ion Errea Fernando de Juan Miguel M. Ugeda |
| author_facet | Wen Wan Rishav Harsh Antonella Meninno Paul Dreher Sandra Sajan Haojie Guo Ion Errea Fernando de Juan Miguel M. Ugeda |
| author_sort | Wen Wan |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-03-11T12:40:07Z |
| format | Article |
| id | doaj.art-e5c103b5e5df4e719ab372430de1a82b |
| institution | Directory Open Access Journal |
| issn | 2041-1723 |
| language | English |
| last_indexed | 2024-03-11T12:40:07Z |
| publishDate | 2023-11-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Nature Communications |
| spelling | doaj.art-e5c103b5e5df4e719ab372430de1a82b2023-11-05T12:24:30ZengNature PortfolioNature Communications2041-17232023-11-011411810.1038/s41467-023-42803-4Evidence for ground state coherence in a two-dimensional Kondo latticeWen Wan0Rishav Harsh1Antonella Meninno2Paul Dreher3Sandra Sajan4Haojie Guo5Ion Errea6Fernando de Juan7Miguel M. Ugeda8Donostia International Physics Center (DIPC), Paseo Manuel de Lardizábal 4Donostia International Physics Center (DIPC), Paseo Manuel de Lardizábal 4Centro de Física de Materiales (CSIC-UPV/EHU), Paseo Manuel de Lardizábal 5Donostia International Physics Center (DIPC), Paseo Manuel de Lardizábal 4Donostia International Physics Center (DIPC), Paseo Manuel de Lardizábal 4Donostia International Physics Center (DIPC), Paseo Manuel de Lardizábal 4Donostia International Physics Center (DIPC), Paseo Manuel de Lardizábal 4Donostia International Physics Center (DIPC), Paseo Manuel de Lardizábal 4Donostia International Physics Center (DIPC), Paseo Manuel de Lardizábal 4Abstract 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.https://doi.org/10.1038/s41467-023-42803-4 |
| spellingShingle | Wen Wan Rishav Harsh Antonella Meninno Paul Dreher Sandra Sajan Haojie Guo Ion Errea Fernando de Juan Miguel M. Ugeda Evidence for ground state coherence in a two-dimensional Kondo lattice Nature Communications |
| title | Evidence for ground state coherence in a two-dimensional Kondo lattice |
| title_full | Evidence for ground state coherence in a two-dimensional Kondo lattice |
| title_fullStr | Evidence for ground state coherence in a two-dimensional Kondo lattice |
| title_full_unstemmed | Evidence for ground state coherence in a two-dimensional Kondo lattice |
| title_short | Evidence for ground state coherence in a two-dimensional Kondo lattice |
| title_sort | evidence for ground state coherence in a two dimensional kondo lattice |
| url | https://doi.org/10.1038/s41467-023-42803-4 |
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