This website requires JavaScript.

# Peculiarities of the density of states in SN bilayers

May 2022

We study the density of states (DoS) $\nu(E)$ in a normal-metallic (N) filmcontacted by a bulk superconductor (S). We assume that the system is diffusiveand the SN interface is transparent. In the limit of thin N layer (compared tothe coherence length), we analytically find three different types of the DoSpeculiarity at energy equal to the bulk superconducting order parameter$\Delta_0$. (i) In the absence of the inverse proximity effect, the peculiarityhas the check-mark form with $\nu(\Delta_0)=0$ as long as the thickness of theN layer is smaller than a critical value. (ii) When the inverse proximityeffect comes into play, the check-mark is immediately elevated so that$\nu(\Delta_0)>0$. (iii) Upon further increasing of the inverse proximityeffect, $\nu(E)$ gradually evolves to the vertical peculiarity (with aninfinite-derivative inflection point at $E=\Delta_0$). This crossover iscontrolled by a materials-matching parameter which depends on the relativedegree of disorder in the S and N materials.

Q1论文试图解决什么问题？
Q2这是否是一个新的问题？
Q3这篇文章要验证一个什么科学假设？
0