Local density of states in a dirty normal metal connected to a superconductor
Local density of states in a dirty normal metal connected to a superconductor
复制标题
DOI：
10.1103/physrevb.54.9443
复制
发表时间：
1996-10-01
影响因子：
3.7
通讯作者：
Schon, G
中科院分区：
文献类型：
--
作者：
Belzig, W;Bruder, C;Schon, G
当超导体与普通金属接触时，不仅会产生超导相关性，即邻近效应，而且还会改变距离界面一定距离处的凝视密度。这些变化可以通过实验在微结构系统中解决。因此，我们研究了超导体-正常金属异质结构N（E,x）态的局域密度。我们发现在小能量下N（E,x）的抑制作用持续到大距离。如果正常金属形成厚度为L(n)的薄层，则会出现与hhard /L(n)(2)相似的Thouless能量数量级的态密度小缺口。磁场抑制了这些特征。我们发现与Gueron等人最近的实验很吻合。
A superconductor in contact with a normal metal not only induces superconducting correlations, known as the proximity effect, but also modifies the density of stares at some distance from the interface. These modifications can be resolved experimentally in microstructured systems. We therefore study the local density of states N(E,x) of a superconductor-normal-metal heterostructure. We find a suppression of N(E,x) at small energies, which persists to large distances. If the normal metal forms a thin layer of thickness L(n), a minigap in the density of states appears which is of the order of the Thouless energy similar to HBARD/L(n)(2). A magnetic field suppresses the features. We find good agreement with recent experiments of Gueron et al.