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Orbital-selective metal skin induced by alkali-metal-dosing Mott-insulating Ca 2 RuO 4

Horio, M. (author)
University of Tokyo, Japan,Universität Zürich,University of Zürich
Forte, Filomena (author)
Universita degli Studi di Salerno,University of Salerno,SPIN CNR Institute - Salerno
Sutter, D. (author)
Universität Zürich,University of Zürich
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Kim, Minjae (author)
Université Paris-Saclay,University Paris-Saclay,Collège de France,Korea Institute for Advanced Study
Fatuzzo, C. G. (author)
Universität Zürich,University of Zürich
Matt, C. E. (author)
Universität Zürich,University of Zürich
Moser, Simon (author)
Lawrence Berkeley National Laboratory,Julius-Maximilians Universität Würzburg,University of Würzburg
Wada, Tetsuya (author)
University of Tokyo, Japan
Granata, Veronica (author)
Universita degli Studi di Salerno,University of Salerno
Fittipaldi, R. (author)
Universita degli Studi di Salerno,University of Salerno,SPIN CNR Institute - Salerno
Sassa, Yasmine, 1981 (author)
Chalmers tekniska högskola,Chalmers University of Technology
Gatti, Gianmarco (author)
Université de Genève,University of Geneva,Ecole Polytechnique Federale de Lausanne (EPFL),Swiss Federal Institute of Technology in Lausanne (EPFL)
Rønnow, H. M. (author)
Ecole Polytechnique Federale de Lausanne (EPFL),Swiss Federal Institute of Technology in Lausanne (EPFL)
Hoesch, M. (author)
Diamond Light Source,Deutsches Elektronen-Synchrotron (DESY)
Kim, Timur K. (author)
Diamond Light Source
Jozwiak, Chris (author)
Lawrence Berkeley National Laboratory
Bostwick, Aaron (author)
Lawrence Berkeley National Laboratory
Rotenberg, E. (author)
Lawrence Berkeley National Laboratory
Matsuda, Iwao (author)
University of Tokyo, Japan
Georges, A. (author)
Université de Genève,University of Geneva,Université Paris-Saclay,University Paris-Saclay,Collège de France,Flatiron Institute
Sangiovanni, Giorgio (author)
Julius-Maximilians Universität Würzburg,University of Würzburg
Vecchione, A. (author)
SPIN CNR Institute - Salerno,Universita degli Studi di Salerno,University of Salerno
Cuoco, M. (author)
Universita degli Studi di Salerno,University of Salerno,SPIN CNR Institute - Salerno
Chang, J. (author)
Universität Zürich,University of Zürich
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 (creator_code:org_t)
2023
2023
English.
In: Communications Physics. - 2399-3650. ; 6:1
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  • Journal article (peer-reviewed)
Abstract Subject headings
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  • 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.

Subject headings

NATURVETENSKAP  -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)
NATURVETENSKAP  -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Condensed Matter Physics (hsv//eng)

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