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Moser S.,Advanced Light Source ALS | Moser S.,Ecole Polytechnique Federale de Lausanne | Moreschini L.,Advanced Light Source ALS | Jacimovic J.,Ecole Polytechnique Federale de Lausanne | And 10 more authors.
Physical Review Letters | Year: 2013

Oxygen vacancies created in anatase TiO2 by UV photons (80-130 eV) provide an effective electron-doping mechanism and induce a hitherto unobserved dispersive metallic state. Angle resolved photoemission reveals that the quasiparticles are large polarons. These results indicate that anatase can be tuned from an insulator to a polaron gas to a weakly correlated metal as a function of doping and clarify the nature of conductivity in this material. © 2013 American Physical Society. Source


Moser S.,Ecole Polytechnique Federale de Lausanne | Moreschini L.,Advanced Light Source ALS | Yang H.-Y.,Ecole Polytechnique Federale de Lausanne | Innocenti D.,Advanced Light Source ALS | And 15 more authors.
Physical Review Letters | Year: 2014

We investigate by angle-resolved photoemission the electronic structure of in situ grown tetragonal CuO, a synthetic quasi-two-dimensional edge-sharing cuprate. We show that, in spite of the very different nature of the copper oxide layers, with twice as many Cu in the CuO layers of tetragonal CuO as compared to the CuO2 layers of the high-Tc cuprates, the low-energy electronic excitations are surprisingly similar, with a Zhang-Rice singlet dispersing on weakly coupled cupratelike sublattices. This system should thus be considered as a member of the high-Tc cuprate family, with, however, interesting differences due to the intralayer coupling between the cupratelike sublattices. © 2014 American Physical Society. Source

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