论文标题
平面约瑟夫森连接处的安德里·绑定状态的基于Flip-Chip的微波光谱
Flip-chip-based microwave spectroscopy of Andreev bound states in a planar Josephson junction
论文作者
论文摘要
我们使用电感耦合的超导性低损坏谐振器在栅极可调的平面Josephson结中演示了一种基于Flip-Chip的方法，用于在栅极可调的平面Josephson连接处的微波测量方法。通过静电门控，我们介绍了对Andreev结合状态的密度和传输的控制。设备的相位偏置移动了谐振器频率，这与连接中超电流的调制一致。两色谱光谱测量结果表明，隔离的Andreev绑定状态与平均诱导的超导差距为$ 184〜 \ MATHRM {μEV} $，而登机式传输接近$ 0.98 $。我们的结果代表了使用Flip-Chip技术来解决和研究平面Josephson交界处的Andreev结合状态的可行性，并且它们为使用超导体 - 二维材料的微波应用提供了有希望的途径。
We demonstrate a flip-chip-based approach to microwave measurements of Andreev bound states in a gate-tunable planar Josephson junction using inductively-coupled superconducting low-loss resonators. By means of electrostatic gating, we present control of both the density and transmission of Andreev bound states. Phase biasing of the device shifted the resonator frequency, consistent with the modulation of supercurrent in the junction. Two-tone spectroscopy measurements revealed an isolated Andreev bound state consistent with an average induced superconducting gap of $184~\mathrm{μeV}$ and a gate-tunable transmission approaching $0.98$. Our results represent the feasibility of using the flip-chip technique to address and study Andreev bound states in planar Josephson junctions, and they give a promising path towards microwave applications with superconductor-semiconductor two-dimensional materials.
