论文标题
基于KTAO3的二维电子气体中的金属 - 绝缘体相分离
Metal-insulator phase separation in KTaO3-based two-dimensional electron gas
论文作者
论文摘要
电子相分离（EPS）源自电子相之间的不完全转化，导致电子特性的不均匀空间分布。在二维电子气体（2DEG）的系统中，通常基于渗透性金属到固定器的过渡识别EPS。在这里，我们报告了基于KTAO3的2DEG中的金属 - 绝缘体过渡（MIT），导电通道的宽度降低为微米尺度。由于金属和绝缘阶段之间的竞争，观察到滞电性 - 温度关系，这是通过磁场调节的。这种依赖大小的MIT效应归因于金属和绝缘阶段的共存和分离。结合了密度功能理论计算，我们提出了一个理论模型，使用渗透理论模拟EPS的动态过程，证明了大小依赖性MIT的机制。我们的工作提出了一个清晰，简单的2DEG平台，以实现金属和绝缘阶段的空间共存。
Electronic phase separation (EPS) originates from an incomplete transformation between electronic phases, causing the inhomogeneous spatial distribution of electronic properties. In the system of two-dimensional electron gas (2DEG), the EPS is usually identified based on a percolative metal-to-superconductor transition. Here, we report a metal-insulator transition (MIT) in KTaO3-based 2DEG with the width of conductive channel decreasing into micrometer scale. Hysteretic resistance-temperature relations are observed due to the competition between metallic and insulating phases, which is tunable by magnetic field. Such a size-dependent MIT effect is attributed to the coexistence and separation of metallic and insulating phases. Combining density functional theory calculation, we propose a theoretical model to simulate the dynamic process of the EPS using the percolation theory, demonstrating the mechanism of size-dependent MIT. Our work suggests a clear and simple 2DEG platform to achieve the spatial coexistence of metallic and insulating phases.
