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

DOI: 10.1038/s42005-023-01436-1 DOI Help

Authors: Masafumi Horio (The University of Tokyo; Universität Zürich) , Filomena Forte (CNR-SPIN; Università di Salerno) , Denys Sutter (University of Zurich) , Minjae Kim (Collège de France; Ecole Polytechnique, CNRS, Université Paris-Saclay; Korea Institute for Advanced Study) , Claudia G. Fatuzzo (Universität Zürich) , Christian E. Matt (Universität Zürich) , Simon Moser (Universität Würzburg) , Tetsuya Wada (The University of Tokyo) , Veronica Granata (Università di Salerno) , Rosalba Fittipaldi (CNR-SPIN; Università di Salerno) , Yasmine Sassa (Chalmers University of Technology) , Gianmarco Gatti (Institute of Physics, École Polytechnique Fedérale de Lausanne (EPFL); University of Geneva) , Henrik M. Ronnow (Institute of Physics, École Polytechnique Fedérale de Lausanne (EPFL)) , Moritz Hoesch (Diamond Light Source; Deutsches Elektronen-Synchrotron DESY) , Timur K. Kim (Diamond Light Source) , Chris Jozwiak (Advanced Light Source (ALS)) , Aaron Bostwick (Advanced Light Source (ALS)) , Eli Rotenberg (Advanced Light Source (ALS)) , Iwao Matsuda (The University of Tokyo) , Antoine Georges (Ecole Polytechnique, CNRS, Université Paris-Saclay; University of Geneva; Flatiron Institut) , Giorgio Sangiovanni (Universität Würzburg) , Antonio Vecchione (CNR-SPIN; Università di Salerno) , Mario Cuoco (CNR-SPIN; Università di Salerno) , Johan Chang (Universität Zürich)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Communications Physics , VOL 6

State: Published (Approved)
Published: November 2023
Diamond Proposal Number(s): 10550

Open Access Open Access

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.

Subject Areas: Materials, Physics

Instruments: I05-ARPES

Other Facilities: MAESTRO at ALS

Added On: 09/11/2023 09:32


Discipline Tags:

Superconductors Quantum Materials Physics Hard condensed matter - structures Materials Science

Technical Tags:

Spectroscopy Angle Resolved Photoemission Spectroscopy (ARPES)