Orbital-selective metal skin induced by alkali-metal-dosing Mott-insulating Ca2 RuO4
Artikel i vetenskaplig tidskrift, 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.
Författare
M. Horio
University of Tokyo
Universität Zürich
Filomena Forte
Universita degli Studi di Salerno
SPIN CNR Institute - Salerno
D. Sutter
Universität Zürich
Minjae Kim
Université Paris-Saclay
Collège de France
Korea Institute for Advanced Study
C. G. Fatuzzo
Universität Zürich
C. E. Matt
Universität Zürich
Simon Moser
Lawrence Berkeley National Laboratory
Julius-Maximilians Universität Würzburg
Tetsuya Wada
University of Tokyo
Veronica Granata
Universita degli Studi di Salerno
R. Fittipaldi
Universita degli Studi di Salerno
SPIN CNR Institute - Salerno
Yasmine Sassa
Chalmers, Fysik, Materialfysik
Gianmarco Gatti
Université de Genève
Ecole Polytechnique Federale de Lausanne (EPFL)
H. M. Rønnow
Ecole Polytechnique Federale de 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
Université de Genève
Université Paris-Saclay
Collège de France
Flatiron Institute
Giorgio Sangiovanni
Julius-Maximilians Universität Würzburg
A. Vecchione
SPIN CNR Institute - Salerno
Universita degli Studi di Salerno
M. Cuoco
Universita degli Studi di Salerno
SPIN CNR Institute - Salerno
J. Chang
Universität Zürich
Communications Physics
23993650 (eISSN)
Vol. 6 1 323Framtidens Lågdimensionella Skyrmion Material
Vetenskapsrådet (VR) (2017-05078), 2019-06-01 -- 2021-12-31.
Ämneskategorier
Atom- och molekylfysik och optik
Den kondenserade materiens fysik
DOI
10.1038/s42005-023-01436-1