'Smile'-gap in the density of states of a cavity between superconductors
| Autor: | Reutlinger, J., Glazman, L., Nazarov, Yu. V., Belzig, W. |
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| Rok vydání: | 2013 |
| Předmět: | |
| Zdroj: | Phys. Rev. Lett. 112, 067001 (2014) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevLett.112.067001 |
| Popis: | The density of Andreev levels in a normal metal ($N$) in contact with two superconductors ($S$) is known to exhibit an induced minigap related to the inverse dwell time. We predict a small secondary gap just below the superconducting gap edge---a feature that has been overlooked so far in numerous studies of the density of states in $S-N-S$ structures. In a generic structure with $N$ being a chaotic cavity, the secondary gap is the widest at zero phase bias. It closes at some finite phase bias, forming the shape of a "smile". Asymmetric couplings give even richer gap structures near the phase difference \pi. All the features found should be amendable to experimental detection in high-resolution low-temperature tunneling spectroscopy. Comment: 5 pages, 4 figures |
| Databáze: | arXiv |
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