论文标题
电场可调超导性的电场控制和氧化物界面上量子金属的出现
Electric field control of disorder-tunable superconductivity and the emergence of quantum metal at an oxide interface
论文作者
论文摘要
我们报告了超导laalo3/ktao3（111）与TC〜2K的界面的特殊野外效应。通过在KTAO3上施加栅极电压（VG），可以连续调整界面，从超导到绝缘状态，从而产生圆顶形状的TC-VG依赖性。在霍尔效应测量中证明，电控对载体密度只有较小的影响，而它改变了界面中载体的空间轮廓，因此载体的疾病水平显着。随着温度的降低，尽管初始的剧烈降低或增加，但在超导和绝缘侧的最低温度下，电阻会饱和，这表明与失败的超导体和/或脆弱绝缘体相关的量子金属状态的出现。磁场驱动的超导体对绝缘子量子相变的VG调节揭示了非宇宙关键性。
We report on an extraordinary field effect of the superconducting LaAlO3/KTaO3(111) interface with Tc ~2 K. By applying a gate voltage (VG) across KTaO3, the interface can be continuously tuned from superconducting into insulating states, yielding a dome-shaped Tc-VG dependence. The electric gating has only a minor effect on carrier density as evidenced in the Hall-effect measurement, while it changes spatial profile of the carriers in the interface, hence the carrier's disorder level significantly. As temperature is decreased, the resistance saturates at lowest temperature in both superconducting and insulating sides, despite an initial dramatic dropping or increasing, which suggests an emergence of quantum metallic state associated with failed superconductor and/or fragile insulator. A VG-modulation of the magnetic-field-driven superconductor to insulator quantum phase transition reveals a non-universal criticality.
