Heavy fermions vs doped Mott physics in heterogeneous Ta-dichalcogenide bilayers

  • Controlling and understanding electron correlations in quantum matter is one of the most challenging tasks in materials engineering. In the past years a plethora of new puzzling correlated states have been found by carefully stacking and twisting two-dimensional van der Waals materials of different kind. Unique to these stacked structures is the emergence of correlated phases not foreseeable from the single layers alone. In Ta-dichalcogenide heterostructures made of a good metallic “1H”- and a Mott insulating “1T”-layer, recent reports have evidenced a cross-breed itinerant and localized nature of the electronic excitations, similar to what is typically found in heavy fermion systems. Here, we put forward a new interpretation based on first-principles calculations which indicates a sizeable charge transfer of electrons (0.4-0.6 e) from 1T to 1H layers at an elevated interlayer distance. We accurately quantify the strength of the interlayer hybridization which allows us to unambiguously determine that the system is much closer to a doped Mott insulator than to a heavy fermion scenario. Ta-based heterolayers provide therefore a new ground for quantum-materials engineering in the regime of heavily doped Mott insulators hybridized with metallic states at a van der Waals distance.

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Author:Lorenzo CrippaORCiD, Hyeonhu BaeORCiD, Paul WunderlichORCiD, Igor I. MazinORCiD, Binghai YanORCiD, Giorgio SangiovanniORCiDGND, Tim O. WehlingORCiDGND, Roser ValentíORCiDGND
URN:urn:nbn:de:hebis:30:3-824328
DOI:https://doi.org/10.1038/s41467-024-45392-y
ISSN:2041-1723
ArXiv Id:http://arxiv.org/abs/2402.03544
Parent Title (English):Nature Communications
Publisher:Nature Publishing Group UK
Place of publication:[London]
Document Type:Article
Language:English
Date of Publication (online):2024/02/14
Date of first Publication:2024/02/14
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Release Date:2024/02/19
Volume:15
Issue:1357
Article Number:1357
Page Number:8
Institutes:Physik / Physik
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik
Sammlungen:Universitätspublikationen
Licence (German):License LogoCreative Commons - Namensnennung 4.0