Orbital-selective metal skin induced by alkali-metal-dosing Mott-insulating Ca2 RuO4
Journal article, 2023
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.
Author
M. Horio
University of Zürich
University of Tokyo
Filomena Forte
National Research Council of Italy (CNR)
University of Salerno
D. Sutter
University of Zürich
Minjae Kim
University Paris-Saclay
Korea Institute for Advanced Study
Collège de France
C. G. Fatuzzo
University of Zürich
C. E. Matt
University of Zürich
Simon Moser
Lawrence Berkeley National Laboratory
University of Würzburg
Tetsuya Wada
University of Tokyo
Veronica Granata
University of Salerno
R. Fittipaldi
National Research Council of Italy (CNR)
University of Salerno
Yasmine Sassa
Chalmers, Physics, Materials Physics
Gianmarco Gatti
University of Geneva
Swiss Federal Institute of Technology in Lausanne (EPFL)
H. M. Rønnow
Swiss Federal Institute of Technology in Lausanne (EPFL)
M. Hoesch
Diamond Light Source
Deutsches Elektronen-Synchrotron (DESY)
Timur K. Kim
Diamond Light Source
Chris Jozwiak
Lawrence Berkeley National Laboratory
Aaron Bostwick
Lawrence Berkeley National Laboratory
E. Rotenberg
Lawrence Berkeley National Laboratory
Iwao Matsuda
University of Tokyo
A. Georges
Flatiron Institute
Collège de France
University of Geneva
University Paris-Saclay
Giorgio Sangiovanni
University of Würzburg
A. Vecchione
National Research Council of Italy (CNR)
University of Salerno
M. Cuoco
University of Salerno
National Research Council of Italy (CNR)
J. Chang
University of Zürich
Communications Physics
23993650 (eISSN)
Vol. 6 1 323Realization of Novel Low‐Dimensional Skyrmion Systems
Swedish Research Council (VR) (2017-05078), 2019-06-01 -- 2021-12-31.
Subject Categories (SSIF 2011)
Atom and Molecular Physics and Optics
Condensed Matter Physics
DOI
10.1038/s42005-023-01436-1