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arxiv: 1303.5640 · v1 · submitted 2013-03-22 · ❄️ cond-mat.mtrl-sci · cond-mat.str-el

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Tunable polaronic conduction in anatase TiO2

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classification ❄️ cond-mat.mtrl-sci cond-mat.str-el
keywords anatasetio2anglearpesclarifyconductionconductivitycorrelated
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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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