论文标题
Berezinskii-Kosterlitz-在混合Josephson结阵阵列中的无用过渡和异常金属阶段
The Berezinskii-Kosterlitz-Thouless Transition and Anomalous Metallic Phase in a Hybrid Josephson Junction Array
论文作者
论文摘要
我们研究了半导体 - 驱动器二维Josephson nuction阵列中的Berezinskii-Kosterlitz-thouless（BKT）过渡。该系统由静电顶门调节，表现出单独的超导体（S），异常金属（M*）和绝缘（i）阶段，并由薄板电阻的温度依赖性分离，$ r_ {s} $。我们发现依赖栅极的BKT过渡温度在S-M*边界处降至零，这表明M*相中不完全的涡旋 - 抗反差分。在S阶段，$ r_ {s} $与预期的是BKT过渡时的垂直磁场大致成正比，而在M*阶段$ r_ {s} $中，在低温下，在低温下接近1/2的指数接近1/2的实地，其零字体值偏离了其零字段值。平面磁场消除了M*相，在S-I边界处留下一个较小的缩放指数，我们将其解释为初始M*相的残余。
We investigate the Berezinskii-Kosterlitz-Thouless (BKT) transition in a semiconductor-superconductor two-dimensional Josephson junction array. Tuned by an electrostatic top gate, the system exhibits separate superconducting (S), anomalous metal (M*), and insulating (I) phases, bordered by separatrices of the temperature-dependent of sheet resistance, $R_{s}$. We find that the gate-dependent BKT transition temperature falls to zero at the S-M* boundary, suggesting incomplete vortex-antivortex pairing in the M* phase. In the S phase, $R_{s}$ is roughly proportional to perpendicular magnetic field at the BKT transition, as expected, while in the M* phase $R_{s}$ deviates from its zero-field value as a power-law in field with exponent close to 1/2 at low temperature. An in-plane magnetic field eliminates the M* phase, leaving a small scaling exponent at the S-I boundary, which we interpret as a remnant of the incipient M* phase.
