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- W2177016886 abstract "The polaron is a quasi-particle formed by a conduction electron (or hole) together with its self-induced polarization in a polar semiconductor or an ionic crystal. Among various polarizable examples of complex oxides, strontium titanate (SrTiO3) is one of the most studied. Here we examine the carrier type and the interplay of inner degrees of freedom (for example, charge, lattice, orbital) in SrTiO3. We report the experimental observation of Fröhlich polarons, or large polarons, at the bare SrTiO3 surface prepared by vacuum annealing. Systematic analyses of angle-resolved photoemission spectroscopy and X-ray absorption spectra show that these Fröhlich polarons are two-dimensional and only exist with inversion symmetry breaking by two-dimensional oxygen vacancies. Our discovery provides a rare solvable field theoretical model, and suggests the relevance of large (bi)polarons for superconductivity in perovskite oxides, as well as in high-temperature superconductors." @default.
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- W2177016886 date "2015-10-22" @default.
- W2177016886 modified "2023-10-18" @default.
- W2177016886 title "Observation of a two-dimensional liquid of Fröhlich polarons at the bare SrTiO3 surface" @default.
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- W2177016886 doi "https://doi.org/10.1038/ncomms9585" @default.
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