Switchable Electric Dipole from Polaron Localization in Dielectric Crystals

Kazuki Morita, Yu Kumagai, Fumiyasu Oba, Aron Walsh

Research output: Contribution to journalArticlepeer-review


Ferroelectricity in crystals is associated with the displacement of ions or rotations of polar units. Here we consider the dipole created by donor doping (D+) and the corresponding bound polaron (e-). A dipole of 6.15 Debye is predicted, from Berry phase analysis, in the Ruddlesden-Popper phase of Sr3Ti2O7. A characteristic double-well potential is formed, which persists for high doping densities. The effective Hubbard U interaction can vary the defect state from metallic, a two-dimensional polaron, through to a zero-dimensional polaron. The ferroelectriclike behavior reported here is localized and distinct from conventional spontaneous lattice polarization.

Original languageEnglish
Article number017601
JournalPhysical Review Letters
Issue number1
StatePublished - 1 Jul 2022


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