Abstract
We provide a direct proof of two-electron Andreev transitions in a superconductor–normal-metal tunnel junction by detecting them in a real-time electron counting experiment. Our results are consistent with ballistic Andreev transport with an order of magnitude higher rate than expected for a uniform barrier, suggesting that only part of the interface is effectively contributing to the transport. These findings are quantitatively supported by our direct current measurements in single-electron transistors with similar tunnel barriers.
Original language | English |
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Article number | 217003 |
Number of pages | 4 |
Journal | Physical Review Letters |
Volume | 106 |
Issue number | 21 |
DOIs | |
Publication status | Published - 2011 |
MoE publication type | A1 Journal article-refereed |