Tunable polaronic conduction in anatase TiO2
S. Moser, L. Moreschini, J. Jacimovic, O. S. Barisic, H. Berger, A., Magrez, Y. J. Chang, K. S. Kim, A. Bostwick, E. Rotenberg, L. Forro, and M., Grioni
TL;DR
This study demonstrates that UV-induced oxygen vacancies in anatase TiO2 create a tunable transition from insulating to metallic states, revealing large polaron quasiparticles via ARPES, and clarifying its conduction mechanism.
Contribution
It uncovers the polaronic nature of conduction in anatase TiO2 and shows how UV doping tunes its electronic phases, a novel insight into this material's properties.
Findings
UV photons induce oxygen vacancies in anatase TiO2.
ARPES reveals large polaron quasiparticles.
Material transitions from insulator to metal with doping.
Abstract
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 (ARPES) 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.
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