Rights statement: © 2011 American Physical Society
Final published version, 1.33 MB, PDF document
Research output: Contribution to Journal/Magazine › Journal article › peer-review
Article number | 217003 |
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<mark>Journal publication date</mark> | 25/05/2011 |
<mark>Journal</mark> | Physical review letters |
Issue number | 21 |
Volume | 106 |
Number of pages | 4 |
Pages (from-to) | - |
Publication Status | Published |
<mark>Original language</mark> | English |
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.