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"Smile" gap in the density of states of a cavity between superconductors

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2014

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Nazarov, Yuli V.

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http://nbn-resolving.de/urn:nbn:de:bsz:352-265197
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https://doi.org/10.1103/PhysRevLett.112.067001
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Physical Review Letters. 2014, 112(6). ISSN 0031-9007. eISSN 1079-7114. Available under: doi: 10.1103/PhysRevLett.112.067001

Zusammenfassung

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 microscopic 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 π. All the features found should be amendable to experimental detection in high-resolution low-temperature tunneling spectroscopy.

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ISO 690REUTLINGER, Johannes, Leonid I. GLAZMAN, Yuli V. NAZAROV, Wolfgang BELZIG, 2014. "Smile" gap in the density of states of a cavity between superconductors. In: Physical Review Letters. 2014, 112(6). ISSN 0031-9007. eISSN 1079-7114. Available under: doi: 10.1103/PhysRevLett.112.067001
BibTex
@article{Reutlinger2014Smile-26519,
  year={2014},
  doi={10.1103/PhysRevLett.112.067001},
  title={"Smile" gap in the density of states of a cavity between superconductors},
  number={6},
  volume={112},
  issn={0031-9007},
  journal={Physical Review Letters},
  author={Reutlinger, Johannes and Glazman, Leonid I. and Nazarov, Yuli V. and Belzig, Wolfgang}
}
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