Polar coupling enabled nonlinear optical filtering at MoS2/ferroelectric heterointerfaces

Dawei Li, Xi Huang, Zhiyong Xiao, Hanying Chen, Le Zhang, Yifei Hao, Jingfeng Song, Ding-Fu Shao, Evgeny Y. Tsymbal, Yongfeng Lu () and Xia Hong ()
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Dawei Li: University of Nebraska-Lincoln
Xi Huang: University of Nebraska-Lincoln
Zhiyong Xiao: University of Nebraska-Lincoln
Hanying Chen: University of Nebraska-Lincoln
Le Zhang: University of Nebraska-Lincoln
Yifei Hao: University of Nebraska-Lincoln
Jingfeng Song: University of Nebraska-Lincoln
Ding-Fu Shao: University of Nebraska-Lincoln
Evgeny Y. Tsymbal: University of Nebraska-Lincoln
Yongfeng Lu: University of Nebraska-Lincoln
Xia Hong: University of Nebraska-Lincoln

Nature Communications, 2020, vol. 11, issue 1, 1-8

Abstract: Abstract Complex oxide heterointerfaces and van der Waals heterostructures present two versatile but intrinsically different platforms for exploring emergent quantum phenomena and designing new functionalities. The rich opportunity offered by the synergy between these two classes of materials, however, is yet to be charted. Here, we report an unconventional nonlinear optical filtering effect resulting from the interfacial polar alignment between monolayer MoS2 and a neighboring ferroelectric oxide thin film. The second harmonic generation response at the heterointerface is either substantially enhanced or almost entirely quenched by an underlying ferroelectric domain wall depending on its chirality, and can be further tailored by the polar domains. Unlike the extensively studied coupling mechanisms driven by charge, spin, and lattice, the interfacial tailoring effect is solely mediated by the polar symmetry, as well explained via our density functional theory calculations, pointing to a new material strategy for the functional design of nanoscale reconfigurable optical applications.

Date: 2020
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DOI: 10.1038/s41467-020-15191-2

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