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
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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