We study the dc-current transport in a voltage biased superconductor-chaotic-dot-superconductor junction with an induced proximity effect in the dot. It is found that for a Thouless energy (formula presented) of the dot smaller than the superconducting energy gap (formula presented) the proximity effect is manifested as peaks in the differential conductance at voltages of order (formula presented) away from the even subharmonic gap structures (formula presented) These peaks are insensitive to temperatures (formula presented) but are suppressed by a weak magnetic field. This provides a qualitative explanation for recent experimental observations by Kutchinsky et al. [Phys. Rev. B 56, R2932 (1997)].
|Number of pages||4|
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|State||Published - 2002|