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

Abstract

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
Volume178
DOIs
StatePublished - Mar 15 2020

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys

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