Switchable Electric Dipole from Polaron Localization in Dielectric Crystals

Kazuki Morita, Yu Kumagai, Fumiyasu Oba, Aron Walsh

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


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
Publication statusPublished - 2022 Jul 1

Bibliographical note

Publisher Copyright:
© 2022 American Physical Society.

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


Dive into the research topics of 'Switchable Electric Dipole from Polaron Localization in Dielectric Crystals'. Together they form a unique fingerprint.

Cite this