Engineering nanoscale polarization at the SrTiO3/Ge interface

Tony Le, Onur Kurt, Jun Ouyang, Jianjun Wang, Long Qing Chen, Edward L. Lin, John G. Ekerdt, Yuhang Ren

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


The ability to manipulate electric polarization at reduced dimension has recently generated intense research interests. Here, we report the engineering of interfacial ferroelectricity by the monolithic integration of a single crystalline SrTiO3 (STO) film on a germanium Ge(001) substrate. A combination of nonlinear optical measurements, microstructural analyses, and phase-field simulations provide evidences of room-temperature ferroelectricity in the epitaxial STO ultrathin film. We show that the collective atomic displacements of Ti near the STO/Ge interface are responsible for the generation of an in-plane ferroelectric polarization. An a1/a2 domain pattern with a stable net polarization along the [110] in-plane direction is revealed.

Original languageEnglish (US)
Pages (from-to)489-492
Number of pages4
JournalScripta Materialia
StatePublished - Mar 15 2020

All Science Journal Classification (ASJC) codes

  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys


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