Energy dependent counting statistics in superconducting tunnel junctions

P. Samuelsson

doi:10.1103/PhysRevB.67.054508

← Back to search

Energy dependent counting statistics in superconducting tunnel junctions

P. Samuelsson

DOI 10.1103/PhysRevB.67.054508 · Physical Review B

T1

Active bibliographic source — not scientific approval

Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.

Abstract

We present an investigation of the energy dependence of the full charge counting statistics in normal-insulating–normal-insulating–superconducting junctions. It is found that the current in general is transported via a correlated transfer of pairs of electrons. Only in the case of strongly asymmetric tunnel barriers or energies much larger than the inverse escape time from the region between the barriers is the pair transfer uncorrelated. The second cumulant, the noise, is found to depend strongly on the applied voltage and temperature. For a junction resistance dominated by the tunnel barrier to the normal reservoir, the differential shot noise shows a double peak feature at voltages of the order of the inverse escape time, a signature of an ensemble averaged electron-hole resonance.