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首页> 外文会议>NATO Advanced Study Institute on Theory of Quantum Transport in Metallic and Hybrid Nanostructures; 20030825-29; St.Petersburg(RU) >STM Spectroscopy of the Local Density of States in Normal Metal - Superconductor Systems
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STM Spectroscopy of the Local Density of States in Normal Metal - Superconductor Systems

机译：普通金属-超导体系统中状态局部密度的STM光谱

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摘要

At the contact with a Superconductor, the electrons from a Normal metal are Andreev-reflected. This modifies the normal metal electronic properties in the vicinity of the interface, including the local density of states (LDOS). A gap of reduced width (a mini-gap) is expected in the normal metal if its size is small as compared to the phase-breaking length. Otherwise, a pseudo-gap is expected. We performed the local spectroscopy of Normal-metal-Superconductor (N-S) structures with the help of a very low temperature (60 mK) Scanning Tunneling Microscope (STM). Both structures with a lateral and with a bilayer geometry were investigated. By comparing the experimental spectra with the predictions of the quasi-classical theory, we found a good agreement in many cases but also some clear discrepancies, especially in the mini-gap regime.
机译：与超导体接触时，来自正常金属的电子被安德列夫反射。这会修改界面附近的正常金属电子属性，包括状态的局部密度（LDOS）。如果普通金属的尺寸与断相长度相比较小，则可以预期宽度减小的间隙（微小间隙）。否则，将出现伪间隙。我们借助非常低的温度（60 mK）扫描隧道显微镜（STM）对普通金属超导体（N-S）结构进行了局部光谱学分析。研究了具有横向几何结构和双层几何结构的两种结构。通过将实验光谱与准经典理论的预测结果进行比较，我们发现在很多情况下都具有良好的一致性，但也存在一些明显的差异，特别是在小间隙方案中。

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