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Coherent current transport in wide ballistic Josephson junctions

P. Samuelsson·A. Ingerman·G. Johansson·E. V. Bezuglyi·V. S. Shumeiko·G. Wendin·R. Kursten·A. Richter·T. Matsuyama·U. Merkt
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Abstract

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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P. Samuelsson, A. Ingerman, G. Johansson, E. V. Bezuglyi, V. S. Shumeiko, G. Wendin, R. Kursten, A. Richter, T. Matsuyama, U. Merkt. 2003-11-14. Coherent current transport in wide ballistic Josephson junctions. https://doi.org/10.1103/physrevb.70.212505

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