Polar coupling enabled nonlinear optical filtering at MoS2/ferroelectric heterointerfaces
Polar coupling enabled nonlinear optical filtering at MoS2/ferroelectric heterointerfaces
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DOI：
10.1038/s41467-020-15191-2
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发表时间：
2020-03-17
影响因子：
16.6
通讯作者：
Hong, Xia
中科院分区：
文献类型：
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作者：
Li, Dawei;Huang, Xi;Hong, Xia
复杂氧化物异质界面和范德华异质结构为探索量子新现象和设计新功能提供了两个用途广泛但本质不同的平台。然而，这两类材料之间的协同作用提供了丰富的机会，但尚未绘制出图表。在这里，我们报道了一种非传统的非线性光学滤波效应，这是由于单层MoS_2与相邻的铁电氧化物薄膜之间的界面极性排列引起的。异质界面上的二次谐波响应根据其手性的不同，要么被铁电磁畴壁大大增强，要么被基本完全熄灭，并且可以被极化域进一步裁剪。与被广泛研究的由电荷、自旋和晶格驱动的耦合机制不同，界面剪裁效应完全由极性对称性调节，并通过我们的密度泛函理论计算进行了解释，为纳米级可重构光学应用的功能设计指明了一种新的材料策略。
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.