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Atomic scale crystal field mapping of polar vortices in oxide superlattices
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Atomic scale crystal field mapping of polar vortices in oxide superlattices
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Atomic scale crystal field mapping of polar vortices in oxide superlattices
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Journal Article
Atomic scale crystal field mapping of polar vortices in oxide superlattices
2021
Overview
Polar vortices in oxide superlattices exhibit complex polarization topologies. Using a combination of electron energy loss near-edge structure analysis, crystal field multiplet theory, and first-principles calculations, we probe the electronic structure within such polar vortices in [(PbTiO
3
)
16
/(SrTiO
3
)
16
] superlattices at the atomic scale. The peaks in Ti
L
-edge spectra shift systematically depending on the position of the Ti
4+
cations within the vortices i.e., the direction and magnitude of the local dipole. First-principles computation of the local projected density of states on the Ti
3
d
orbitals, together with the simulated crystal field multiplet spectra derived from first principles are in good agreement with the experiments.
The response of the electronic structure to the non-trivial polarization texture in PbTiO
3
/SrTiO
3
superlattices has not been explored. Here, the authors reveal how the peaks of the spectra shift and change their local electronic structure depending on the position of the Ti cation.
