Print Email Facebook Twitter “Smile” Gap in the Density of States of a Cavity between Superconductors Title “Smile” Gap in the Density of States of a Cavity between Superconductors Author Reutlinger, J. Glazman, L. Nazarov, Y.V. Belzig, W. Faculty Applied Sciences Department QN/Quantum Nanoscience Date 2013-02-11 Abstract 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 ?. All the features found should be amendable to experimental detection in high-resolution low-temperature tunneling spectroscopy. To reference this document use: http://resolver.tudelft.nl/uuid:2f402d0d-c4f5-4c76-8004-7acddba4c471 DOI https://doi.org/10.1103/PhysRevLett.112.067001 Publisher American Physical Society ISSN 0031-9007 Source http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.112.067001 Source Physical Review Letters, 112, 2014 Part of collection Institutional Repository Document type journal article Rights © 2014 American Physical Society Files PDF Nazarov_2014.pdf 1.34 MB Close viewer /islandora/object/uuid:2f402d0d-c4f5-4c76-8004-7acddba4c471/datastream/OBJ/view