| Autor: |
Masafumi Horio, Filomena Forte, Denys Sutter, Minjae Kim, Claudia G. Fatuzzo, Christian E. Matt, Simon Moser, Tetsuya Wada, Veronica Granata, Rosalba Fittipaldi, Yasmine Sassa, Gianmarco Gatti, Henrik M. Rønnow, Moritz Hoesch, Timur K. Kim, Chris Jozwiak, Aaron Bostwick, Eli Rotenberg, Iwao Matsuda, Antoine Georges, Giorgio Sangiovanni, Antonio Vecchione, Mario Cuoco, Johan Chang |
| Jazyk: |
angličtina |
| Rok vydání: |
2023 |
| Předmět: |
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| Zdroj: |
Communications Physics, Vol 6, Iss 1, Pp 1-8 (2023) |
| Druh dokumentu: |
article |
| ISSN: |
2399-3650 |
| DOI: |
10.1038/s42005-023-01436-1 |
| Popis: |
Abstract Doped Mott insulators are the starting point for interesting physics such as high temperature superconductivity and quantum spin liquids. For multi-band Mott insulators, orbital selective ground states have been envisioned. However, orbital selective metals and Mott insulators have been difficult to realize experimentally. Here we demonstrate by photoemission spectroscopy how Ca2RuO4, upon alkali-metal surface doping, develops a single-band metal skin. Our dynamical mean field theory calculations reveal that homogeneous electron doping of Ca2RuO4 results in a multi-band metal. All together, our results provide evidence for an orbital-selective Mott insulator breakdown, which is unachievable via simple electron doping. Supported by a cluster model and cluster perturbation theory calculations, we demonstrate a type of skin metal-insulator transition induced by surface dopants that orbital-selectively hybridize with the bulk Mott state and in turn produce coherent in-gap states. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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