Comment on "Density of states and reflectionless tunneling in an NS junction with a barrier

Details Comment on "Density of states and reflectionless tunneling in an NS junction with a barrier Comment on "Density of states and reflectionless tunneling in an NS junction with a barrier

1997-10-02

arxiv.org/abs/cond-mat/9710029v1

Physics

Condensed Matter

Superconductivity

1 page

Scientific paper

In a recent paper Schechter, Imry and Levinson (cond-mat/9709248) \cite{r1} analysed the density-of-states (DOS) and the conductance of a S/N junction with a barrier. They showed that the DOS in the N conductor near the barrier is strongly affected by the superconductor if the energy $\epsilon$ is small: $l_{n} \sqrt{\epsilon/D}{\ll} \Gamma {\ll} 1$, where $l_{n}$ is the mean free path, $D$ is the diffusion constant, and $\Gamma$ is the barrier transmittance. We would like to note that this problem was analysed in several papers with the use of different approaches. In particular, the author has calculated the DOS and the conductance of S/N structures with a barrier using quasiclassical matrix Green's function technique well developed in the theory of superconductivity \cite{r2}. It was shown that in an 1-d S/N structure a pseudogap appears in the N conductor near the S/N interface, and the DOS approaches it's normal value at energies $\epsilon$ exceeding an energy $\epsilon_{N}$ related to the interface transmittance; here $\epsilon_{N}=D/(2 R_{b} \sigma)^{2}$, $R_{b}$ is the interface resistance per unit area, and $\sigma$ is the specific conductivity of the N conductor. It was shown that peculiarities in the DOS at small energies lead to a subgap conductance at zero temperature. This subgap conductance is caused by a component of the current which is known in the theory of the Josephson effect as the interference current.Therefore, the results for the DOS and the conductance in Ref \cite{r1} are similar to the ones obtained earlier, but their interpretation of the subgap conductance differs from that given in Ref.\cite{r2} because they use another approach for the calculation of the conductance .

Affiliated with

Also associated with

No associations

Rating

Comment on "Density of states and reflectionless tunneling in an NS junction with a barrier does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Comment on "Density of states and reflectionless tunneling in an NS junction with a barrier, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Comment on "Density of states and reflectionless tunneling in an NS junction with a barrier will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-92290