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Engineering Nanoscale Polarization at the SrTiO 3/Ge Interface

18 Pages Posted: 22 Dec 2019 Publication Status: Accepted

See all articles by Tony Le

Tony Le

City University of New York (CUNY) - Department of Physics and Astronomy

Onur Kurt

City University of New York (CUNY) - Department of Physics and Astronomy

Jun Ouyang

City University of New York (CUNY) - Department of Physics and Astronomy

Jianjun Wang

Pennsylvania State University - Materials Science Institute

Long-Qing Chen

Pennsylvania State University - Department of Materials Science and Engineering; Pennsylvania State University - Materials Research Institute

Edward L. Lin

University of Texas at Austin - McKetta Department of Chemical Engineering

John Ekerdt

University of Texas at Austin - McKetta Department of Chemical Engineering

Yuhang Ren

City University of New York (CUNY) - Department of Physics and Astronomy

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.

Keywords: Nanoelectronics, Electric Polarization, Second Harmonics Generation, Interface Ferroelectricity, Phase Field Simulation

Suggested Citation

Le, Tony and Kurt, Onur and Ouyang, Jun and Wang, Jianjun and Chen, Long-Qing and Lin, Edward L. and Ekerdt, John and Ren, Yuhang, Engineering Nanoscale Polarization at the SrTiO 3/Ge Interface. Available at SSRN: https://ssrn.com/abstract=3507462 or http://dx.doi.org/10.2139/ssrn.3507462

Tony Le

City University of New York (CUNY) - Department of Physics and Astronomy

United States

Onur Kurt

City University of New York (CUNY) - Department of Physics and Astronomy

United States

Jun Ouyang

City University of New York (CUNY) - Department of Physics and Astronomy

United States

Jianjun Wang

Pennsylvania State University - Materials Science Institute ( email )

United States

Long-Qing Chen

Pennsylvania State University - Department of Materials Science and Engineering ( email )

University Park
State College, PA 16802
United States

Pennsylvania State University - Materials Research Institute ( email )

United States

Edward L. Lin

University of Texas at Austin - McKetta Department of Chemical Engineering

2317 Speedway
Austin, TX 78712
United States

John Ekerdt

University of Texas at Austin - McKetta Department of Chemical Engineering

2317 Speedway
Austin, TX 78712
United States

Yuhang Ren (Contact Author)

City University of New York (CUNY) - Department of Physics and Astronomy ( email )

United States

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