Reabsorption of nonequilibrium phonons at superconducting point contacts

Abstract

When there is a deviation from the inequality $d\ll l_{\epsilon }$ ($d$ is the contact diameter, and $l_{\epsilon }$ is the energy relaxation length of the electrons), structural features are produced on the current-voltage characteristics of $S-c-N$ contacts at characteristic phonon energies because of the decrease in $\Delta$ due to the accumulation of nonequilibrium phonons with low group velocities near the contact.

arXiv comment4 pages, 3 figures