Electric Polarization Switching on an Atomically Thin Metallic Oxide,Nano Letters

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Electric Polarization Switching on an Atomically Thin Metallic Oxide
Nano Letters ( IF 9.6 ) Pub Date : 2020-12-11 , DOI: 10.1021/acs.nanolett.0c03417
Mao Ye ₁ , Songbai Hu ₁ , Yuanmin Zhu _{2,

3} , Yubo Zhang ₁ , Shanming Ke ₄ , Lin Xie ₁ , Yuan Zhang ₅ , Sixia Hu ₆ , Dongwen Zhang ₇ , Zhenlin Luo ₈ , Meng Gu _{2,

3} , Jiaqing He ₁ , Peihong Zhang ₉ , Wenqing Zhang ₁ , Lang Chen ₁

Affiliation

Materials with reduced dimensions have been shown to host a wide variety of exotic properties and novel quantum states that often defy textbook wisdom. Polarization switching and metallic screening are well-known examples of mutually exclusive properties that cannot coexist in bulk solids. Here we report the fabrication of (SrRuO₃)₁/(BaTiO₃)₁₀ superlattices that exhibits reversible polarization switching in an atomically thin metallic layer. A multipronged investigation combining structural analyses, electrical measurements, and first-principles electronic structure calculations unravels the coexistence of two-dimensional (2D) metallicity in the SrRuO₃ layer accompanied by the breaking of inversion symmetry, supporting electric polarization along the out-of-plane direction. Such a 2D ferroelectric-like metal paves a novel way to engineer a quantum multistate with unusual coexisting properties, such as ferroelectrics and metals, manipulated by external fields.

中文翻译：

原子薄金属氧化物上的电极化切换

尺寸减小的材料已被证明具有广泛的奇异特性和新颖的量子态，这常常无视教科书的智慧。极化转换和金属屏蔽是相互排斥的特性的众所周知的例子，它们不能共存于大块固体中。在这里，我们报告（SrRuO ₃）₁ /（BaTiO ₃）₁₀超晶格的制造，该超晶格在原子薄的金属层中表现出可逆的偏振转换。将结构分析，电气测量和第一性原理电子结构计算相结合的多管齐下的研究揭示了SrRuO _3中二维（2D）金属性的共存伴随着反演对称性的破坏，支持沿面外方向的极化。这种二维铁电类金属为通过外部场控制具有异常共存特性的量子多态（例如铁电和金属）铺平了一条新颖的途径。

更新日期：2021-01-13

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