Coherent current transport in wide ballistic Josephson junctions

Details Coherent current transport in wide ballistic Josephson junctions Coherent current transport in wide ballistic Josephson junctions

2003-11-14

arxiv.org/abs/cond-mat/0311344v1

Phys. Rev. B 70, 212505 (2004)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures

Scientific paper

10.1103/PhysRevB.70.212505

We present an experimental and theoretical investigation of coherent current transport in wide ballistic superconductor-two dimensional electron gas-superconductor junctions. It is found experimentally that upon increasing the junction length, the subharmonic gap structure in the current-voltage characteristics is shifted to lower voltages, and the excess current at voltages much larger than the superconducting gap decreases. Applying a theory of coherent multiple Andreev reflection, we show that these observations can be explained in terms of transport through Andreev resonances.

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