Shot-noise and conductance measurements of transparent superconductor / two-dimensional electron gas junctions

Details Shot-noise and conductance measurements of transparent superconductor / two-dimensional electron gas junctions Shot-noise and conductance measurements of transparent superconductor / two-dimensional electron gas junctions

2004-10-25

arxiv.org/abs/cond-mat/0410621v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

full paper including figures can be retrieved from: http://www.unibas.ch/phys-meso/Research/Papers/2004/Shot-Noise-Yjunction.p

Scientific paper

10.1103/PhysRevB.72.024501

We have measured the conductance and shot-noise of superconductor-normal metal (S-N) junctions between a Niobium (Nb) film and a 2-dimensional electron gas (2DEG), formed in an InAs-based semiconductor heterostructure. Adjacent to the junction, the 2DEG is shaped into a submicrometer beam-splitter. The current shot-noise measured through one arm of the beam-splitter is found to be enhanced due to Andreev reflection. Both noise and conductance measurements indicate that the Nb-2DEG interface is of high quality with a transparency approaching approx. 60-70 %. The present device can be seen as a quasi-ballistic S-N beam-splitter junction.

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