Interface-Driven Nonlinear Optical Response at MoS2/Ferroelectric Composite Structures

ORAL

Abstract

Integrating layered van der Waals materials such as the transition metal dichalcogenides with ferroelectrics offers the opportunity to introduce new functionalities to the 2D platform, including nonvolatile memory and programmable junctions. In this work, we report a novel nonlinear optical response emerged at the interface between monolayer MoS2 and ferroelectric thin films. We have pre-patterned ferroelectric domain structures with polarization up and down domains on epitaxial PbZr0.2Ti0.8O3 (PZT) thin films using piezoresponse force microscopy, and then transferred on the top MoS2 flakes. We then carried out second-harmonic generation (SHG) microscopy studies on the composite structures. In the reflection mode, we find that the SHG intensity on the ferroelectric domain wall (DW) is highly modulated compared with those on both polar domains, either significantly enhanced or suppressed depending on the chirality of the DW. Stacking angle dependence demonstrates that MoS2 also tunes the polarity of the SHG response on the DW. Our study points to a new strategy to achieve tailored light polarity and intensity modulation via nanoscale ferroelectric control.

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Presenters

  • Dawei Li

    Department of Physics and Astronomy & Nebraska Center for Materials and Nanoscience, University of Nebraska - Lincoln

Authors

  • Dawei Li

    Department of Physics and Astronomy & Nebraska Center for Materials and Nanoscience, University of Nebraska - Lincoln

  • Xi Huang

    Department of Electrical and Computer Engineering, University of Nebraska - Lincoln

  • Zhiyong Xiao

    Department of Physics and Astronomy & Nebraska Center for Materials and Nanoscience, University of Nebraska - Lincoln, Department of Physics and Astronomy & Nebraska Center for Materials and Nanoscience, University of Nebraska-Lincoln

  • Hanying Chen

    Department of Physics and Astronomy & Nebraska Center for Materials and Nanoscience, University of Nebraska - Lincoln, Department of Physics and Astronomy & Nebraska Center for Materials and Nanoscience, University of Nebraska-Lincoln

  • Le Zhang

    Department of Physics and Astronomy & Nebraska Center for Materials and Nanoscience, University of Nebraska-Lincoln, Department of Physics and Astronomy & Nebraska Center for Materials and Nanoscience, University of Nebraska - Lincoln

  • Ding-Fu Shao

    Department of Physics and Astronomy & Nebraska Center for Materials and Nanoscience, University of Nebraska - Lincoln, University of Nebraska - Lincoln

  • Evgeny Y Tsymbal

    Department of Physics and Astronomy & Nebraska Center for Materials and Nanoscience, University of Nebraska, Lincoln, University of Nebraska - Lincoln, Department of Physics and Astronomy & Nebraska Center for Materials and Nanoscience, University of Nebraska-Lincoln, Department of Physics and Astronomy & Nebraska Center for Materials and Nanoscience, University of Nebraska - Lincoln, Institute of Physics

  • Yongfeng Lu

    Department of Electrical and Computer Engineering, University of Nebraska - Lincoln

  • Xia Hong

    Department of Physics and Astronomy & Nebraska Center for Materials and Nanoscience, University of Nebraska - Lincoln, Department of Physics and Astronomy & Nebraska Center for Materials and Nanoscience, University of Nebraska-Lincoln, Univ of Nebraska - Lincoln