Ge/Si nanowire mesoscopic Josephson junctions

Details Ge/Si nanowire mesoscopic Josephson junctions Ge/Si nanowire mesoscopic Josephson junctions

2006-12-06

arxiv.org/abs/cond-mat/0612167v1

Nature Nanotechnology 1, 208 - 213 (2006)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

The controlled growth of nanowires (NWs) with dimensions comparable to the Fermi wavelengths of the charge carriers allows fundamental investigations of quantum confinement phenomena. Here, we present studies of proximity-induced superconductivity in undoped Ge/Si core/shell NW heterostructures contacted by superconducting leads. By using a top gate electrode to modulate the carrier density in the NW, the critical supercurrent can be tuned from zero to greater than 100 nA. Furthermore, discrete sub-bands form in the NW due to confinement in the radial direction, which results in stepwise increases in the critical current as a function of gate voltage. Transport measurements on these superconductor-NW-superconductor devices reveal high-order (n = 25) resonant multiple Andreev reflections, indicating that the NW channel is smooth and the charge transport is highly coherent. The ability to create and control coherent superconducting ordered states in semiconductor-superconductor hybrid nanostructures allows for new opportunities in the study of fundamental low-dimensional superconductivity.

Affiliated with

Also associated with

No associations

Rating

Ge/Si nanowire mesoscopic Josephson junctions 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 Ge/Si nanowire mesoscopic Josephson junctions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Ge/Si nanowire mesoscopic Josephson junctions will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-452100