Quantized conductance in hybrid split-gate arrays of superconducting quantum point contacts with semiconducting two-dimensional electron systems
Quantized conductance in hybrid split-gate arrays of superconducting quantum point contacts with semiconducting two-dimensional electron systems
复制标题
超导量子点与半导体二维电子系统接触的混合分栅阵列中的量子化电导
DOI：
10.1103/physrevapplied.21.014051
复制
发表时间：
2024
影响因子：
4.6
通讯作者：
Delfanazari K
中科院分区：
文献类型：
--
作者：
Delfanazari K
量子点接触（QPC）是一种半导体二维电子系统中具有量子化电导率的缩窄物，是新型自旋电子和拓扑电子电路的组成部分。量子量子计算机还可用作读出电子器件、电荷传感器或量子纳米电路中的开关。一种具有超导接触的短而无杂质的收缩是库珀对QPC模拟物，称为超导量子点接触（SQPC）。由于保持其几何要求和接近统一的超导体-半导体界面透明度的挑战，这种量子器件的技术发展已经延长。在这里，我们开发了先进的纳米制造、材料和器件工程技术，并报告了在半导体二维电子系统中采用分栅技术的纳米级混合SQPC阵列的创新实现。我们利用量子阱的特殊栅极可调性，首次在混合InGaAs-Nb SQPCs中进行了电导量子化的实验观察。我们在单芯片上制造的多个量子纳米器件中观察到零磁场下可重复的量子化电导，并系统地研究了sqpc在低磁场和高磁场下的量子输运，以研究它们在量子计量、极其精确的电压标准和容错量子技术中的潜在应用。
A quantum point contact (QPC)—a constriction in a semiconducting two-dimensional electron system with a quantized conductance—is a building block of novel spintronic and topological electronic circuits. QPCs can also be used as readout electronics, charge sensors, or switches in quantum nanocircuits. A short and impurity-free constriction with superconducting contacts is a Cooper-pair QPC analogue known as a superconducting quantum point contact (SQPC). The technological development of such quantum devices has been prolonged due to the challenges of maintaining their geometrical requirement and near-unity superconductor-semiconductor interface transparency. Here, we develop advanced nanofabrication, material and device engineering techniques and report on an innovative realization of nanoscale hybrid SQPC arrays with split gate technology in semiconducting 2D electron systems. We exploit the special gate tunability of the quantum wells, and demonstrate the first experimental observation of conductance quantization in hybrid InGaAs-Nb SQPCs. We observe reproducible quantized conductance at zero magnetic fields in multiple quantum nanodevices fabricated in a single chip and systematically investigate the quantum transport of SQPCs at low and high magnetic fields for their potential applications in quantum metrology, for extremely accurate voltage standards, and fault-tolerant quantum technologies.
影响因子：
64.8
作者：
Ren, Hechen;Pientka, Falko;Yacoby, Amir
通讯作者：
Yacoby, Amir