论文标题
SRNBO3-SRTIO3异构结构内的维度限制性超导性
Dimensionality-confined superconductivity within SrNbO3-SrTiO3 heterostructures
论文作者
论文摘要
过渡金属氧化物之间的界面能够容纳二维电子气体（2DEG）并表现出异国情调的量子现象。在这里，我们报告了由SRNBO3（SNO）和SRTIO3（STO）组成的异质结构低于230 MK的超导性观察。与其他两个绝缘体不同，金属SNO提供了一种新颖的机制，可以通过电荷转移从大量转移到应变下的界面形成准2DEG。位于界面附近紧张的SNO层中的超导性由具有记录低载体密度的电子系统贡献。值得注意的是，尽管将载体密度高4到5阶的正常金属层嵌入，但电子系统仍然具有独特的保护，以保持高迁移率，并且在极端量子状态下深处。
Interfaces between transition-metal oxides are able to host two-dimensional electron gases (2DEGs) and exhibit exotic quantum phenomena. Here we report the observation of superconductivity below 230 mK for the heterostructure composed of SrNbO3 (SNO) and SrTiO3 (STO). Different from some other counterparts with two insulators, the metallic SNO provides a novel mechanism to form a quasi 2DEG by charge transfer from bulk towards interface under strain. The superconductivity, residing within the strained SNO layer near the interface, is contributed by an electron system with record-low carrier density. Notably, although embedded in a normal metallic layer with a carrier density 4 to 5 orders higher, the electron system is still uniquely well-protected to retain high mobility and lies deep in extreme quantum regime.
