论文标题
在扫描隧道显微镜中，约瑟夫森，安德里弗和单一准粒子电流的统计检测
Statistical detection of Josephson, Andreev, and single quasiparticle currents in scanning tunneling microscopy
论文作者
论文摘要
我们提出了一种方法，可以在可调超导隧道连接中识别不同的隧道模式，该连接由扫描隧道显微镜中的超导尖端和样品组成。结合了从I-V-Z光谱中提取的隧穿电流的相对衰变常数的测量，其对样品表面中原子疾病的统计分析，我们确定了单个准颗粒隧道，多重Andreev Reflection和Josephson Tunneling与偏置偏置的隧道之间的隧道模式的交叉。该方法使人们能够独立于光谱形状来确定特定的隧道状态，并揭示Andreev反射的内在调制和Josephson电流，这对于超导体的量子设备应用至关重要。
We present a method to identify distinct tunneling modes in tunable superconducting tunnel junction composed of superconducting tip and sample in scanning tunneling microscope. Combining the measurement of the relative decay constant of tunneling current extracted from I-V-z spectroscopy with its statistical analysis over the atomic disorders in the sample surface, we identified the crossover of tunneling modes between single quasiparticle tunneling, multiple Andreev reflection, and Josephson tunneling with respect to the bias voltage. The method enables one to determine the particular tunneling regime independently of the spectral shapes, and to reveal the intrinsic modulation of Andreev reflection and Josephson current that would be crucial for quantum device application of superconductors.
