Local Density of States in a Dirty Normal Metal connected to a Superconductor

Details 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

1996-05-07

arxiv.org/abs/cond-mat/9605039v2

Phys. Rev. B 54 (1996) 9443

Physics

Condensed Matter

5 pages, RevTeX, 7 Figures (included), Submitted to PRB. Revised version: One figure changed, missprints corrected

Scientific paper

10.1103/PhysRevB.54.9443

A superconductor in contact with a normal metal not only induces superconducting correlations, known as proximity effect, but also modifies the density of states 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 $\sim \hbar D/L_n^2$. A magnetic field suppresses the features. We find good agreement with recent experiments of Gu\'eron {\it et al.}

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