Journal
SCIENCE ADVANCES
Volume 7, Issue 45, Pages -Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.abj1164
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Funding
- Agence Nationale de la Recherche (ANR) [ANR-16-CE92-0018]
- Investissements d'Avenir program [ANR-10-LABX-0039]
- CNRS International Research Project (IRP) EXCELSIOR
- Japan Society for the Promotion of Science [16H02115, 16KK0107]
- Air Force Office of Scientific Research [FA9550-20-1-0242]
- NWO VICI grant, The Netherlands
- CAPES grant, Brazil
- Grants-in-Aid for Scientific Research [16H02115, 16KK0107] Funding Source: KAKEN
- Agence Nationale de la Recherche (ANR) [ANR-16-CE92-0018] Funding Source: Agence Nationale de la Recherche (ANR)
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This study reveals the temperature-induced MIT in V2O3, characterized by the disappearance of its itinerant conduction band and the shift to larger binding energies of a quasi-localized state. These changes were observed through the energy- and momentum-resolved electronic structure using ARPES.
In solids, strong repulsion between electrons can inhibit their movement and result in a Mott metal-to-insulator transition (MIT), a fundamental phenomenon whose understanding has remained a challenge for over 50 years. A key issue is how the wave-like itinerant electrons change into a localized-like state due to increased interactions. However, observing the MIT in terms of the energy- and momentum-resolved electronic structure of the system, the only direct way to probe both itinerant and localized states, has been elusive. Here we show, using angle-resolved photoemission spectroscopy (ARPES), that in V2O3, the temperature-induced MIT is characterized by the progressive disappearance of its itinerant conduction band, without any change in its energy-momentum dispersion, and the simultaneous shift to larger binding energies of a quasi-localized state initially located near the Fermi level.
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