Journal Article

PUBDB-2024-00286

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Orbital-selective metal skin induced by alkali-metal-dosing Mott-insulating Ca$_2$RuO$_4$

Horio, M. (Corresponding author)Extern* ; Forte, F. (Corresponding author) ; Sutter, D. ; Kim, M. ; Fatuzzo, C. G. ; Matt, C. E. ; Moser, S. ; Wada, T. ; Granata, V. ; Fittipaldi, R. ; Sassa, Y. ; Gatti, G. ; Rønnow, H. M. ; Hoesch, M.DESY* ; Kim, T. K. ; Jozwiak, C. ; Bostwick, A. ; Rotenberg, E. ; Matsuda, I. ; Georges, A. ; Sangiovanni, G. ; Vecchione, A. ; Cuoco, M. ; Chang, J.

2023
Springer Nature London

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Please use a persistent id in citations: doi:10.1038/s42005-023-01436-1  doi:10.3204/PUBDB-2024-00286

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.

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Contributing Institute(s):

1. PETRA-S (FS-PETRA-S)

Research Program(s):

1. 632 - Materials – Quantum, Complex and Functional Materials (POF4-632) (POF4-632)
2. DFG project G:(GEPRIS)390858490 - EXC 2147: Komplexität und Topologie in Quantenmaterialien (CT.QMAT) (390858490) (390858490)
3. DFG project G:(GEPRIS)258499086 - SFB 1170: Topologische und korrelierte Elektronik in Ober- und Grenzflächen ("ToCoTronics") (258499086) (258499086)

Experiment(s):

1. Measurement at external facility

Appears in the scientific report 2023

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Database coverage:
; ; ; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; DOAJ Seal ; Ebsco Academic Search ; IF >= 5 ; JCR ; SCOPUS ; Web of Science Core Collection

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