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- W4313893478 abstract "Oxides lacking a center of symmetry are highly desired, as they usually have fascinating physical properties. However, there are limited numbers of noncentrosymmetric media in nature and most of them do not have multiple functionalities integrated. Here, using the bulk photovoltaic effect as the probing technique, we demonstrate that, at interfaces with a wide range of oxides, strontium titanate (${mathrm{Sr}mathrm{Ti}mathrm{O}}_{3}$) is polar, i.e., with broken inversion symmetry in the quantum paraelectric phase. Studies comprising conductivity and the bulk photovoltaic effect on ${mathrm{La}mathrm{Al}mathrm{O}}_{3}/{mathrm{Sr}mathrm{Ti}mathrm{O}}_{3}$ thin films further show that excessive electronic band bending screens the induced polarity, revealing that appropriate band bending at the interface is the key parameter to control symmetry breaking. Inheriting high carrier mobility from ${mathrm{Sr}mathrm{Ti}mathrm{O}}_{3}$, the polar interface under illumination at low temperatures is conductive or metallic, permitting multifunctionality coupling between the oxides and ${mathrm{Sr}mathrm{Ti}mathrm{O}}_{3}$. Our studies show that significant photovoltaic effects can be generated at the polar interfaces, especially in the quantum-paraelectric phase of ${mathrm{Sr}mathrm{Ti}mathrm{O}}_{3}$, thus giving practical design strategies for multifunctional devices." @default.
- W4313893478 created "2023-01-10" @default.
- W4313893478 creator A5056601153 @default.
- W4313893478 creator A5075638648 @default.
- W4313893478 date "2023-01-09" @default.
- W4313893478 modified "2023-10-07" @default.
- W4313893478 title "Interfacial Symmetry-Breaking Effects in the Quantum Paraelectric <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline overflow=scroll><mml:msub><mml:mrow><mml:mi>Sr</mml:mi><mml:mi>Ti</mml:mi><mml:mi mathvariant=normal>O</mml:mi></mml:mrow><mml:mn>3</mml:mn></mml:msub></mml:math>" @default.
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- W4313893478 doi "https://doi.org/10.1103/physrevapplied.19.014028" @default.
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