Coherent current transport in wide ballistic Josephson junctions

[摘要] 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.

[发布日期] 2004-12-01

[关键词] MULTIPLE ANDREEV-REFLECTION;ENERGY-GAP STRUCTURE;PROXIMITY;QUANTIZATION;SCATTERING