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; M. Grioni

doi:10.1103/PhysRevLett.110.196403

Tunable polaronic conduction in anatase TiO2

Materials Science 2015-06-15 v1 Strongly Correlated Electrons

Authors: 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 , 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 (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.

Keywords

anatase TiO2 polaronic conduction oxygen vacancies large polarons ARPES electron doping

Cite

@article{arxiv.1303.5640,
  title  = {Tunable polaronic conduction in anatase TiO2},
  author = {S. Moser and L. Moreschini and J. Jacimovic and O. S. Barisic and H. Berger and A. Magrez and Y. J. Chang and K. S. Kim and A. Bostwick and E. Rotenberg and L. Forro and M. Grioni},
  journal= {arXiv preprint arXiv:1303.5640},
  year   = {2015}
}

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