Orbital-selective metal skin induced by alkali-metal-dosing Mott-insulating Ca2RuO4 - Archive ouverte HAL
Article Dans Une Revue Communications Physics Année : 2023

Orbital-selective metal skin induced by alkali-metal-dosing Mott-insulating Ca2RuO4

Masafumi Horio
Filomena Forte
Denys Sutter
Minjae Kim
  • Fonction : Auteur
Claudia Fatuzzo
  • Fonction : Auteur
Christian Matt
Simon Moser
  • Fonction : Auteur
Tetsuya Wada
  • Fonction : Auteur
Veronica Granata
  • Fonction : Auteur
Rosalba Fittipaldi
Yasmine Sassa
  • Fonction : Auteur
Gianmarco Gatti
Henrik Rønnow
Moritz Hoesch
Timur Kim
Chris Jozwiak
Aaron Bostwick
Eli Rotenberg
Iwao Matsuda
  • Fonction : Auteur
Antoine Georges
Giorgio Sangiovanni
Antonio Vecchione
Mario Cuoco
Johan Chang

Résumé

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 Ca 2 RuO 4 , upon alkali-metal surface doping, develops a single-band metal skin. Our dynamical mean field theory calculations reveal that homogeneous electron doping of Ca 2 RuO 4 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.

Dates et versions

hal-04529819 , version 1 (02-04-2024)

Identifiants

Citer

Masafumi Horio, Filomena Forte, Denys Sutter, Minjae Kim, Claudia Fatuzzo, et al.. Orbital-selective metal skin induced by alkali-metal-dosing Mott-insulating Ca2RuO4. Communications Physics, 2023, 6 (1), pp.323. ⟨10.1038/s42005-023-01436-1⟩. ⟨hal-04529819⟩
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