Tunable polaronic conduction in anatase TiO2

S. Moser, L. Moreschini, J. Jaćimović, O. S. Barišić, H. Berger, A. Magrez, Y. J. Chang, K. S. Kim, A. Bostwick, E. Rotenberg, L. Forró, M. Grioni

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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 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.

Original languageEnglish
Article number196403
JournalPhysical review letters
Volume110
Issue number19
DOIs
Publication statusPublished - 2013 May 7

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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    Moser, S., Moreschini, L., Jaćimović, J., Barišić, O. S., Berger, H., Magrez, A., Chang, Y. J., Kim, K. S., Bostwick, A., Rotenberg, E., Forró, L., & Grioni, M. (2013). Tunable polaronic conduction in anatase TiO2. Physical review letters, 110(19), [196403]. https://doi.org/10.1103/PhysRevLett.110.196403