Symmetry breaking in the tunneling conductance of a superconducting vortex

Leadbeater, M. and Lambert, C. J. (1996) Symmetry breaking in the tunneling conductance of a superconducting vortex. Czechoslovak Journal of Physics, 46 (SUPPL.). pp. 1797-1798. ISSN 0011-4626

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Recent experiments on c-axis tunneling into a vortex core of YBCO have yielded a sub-gap differential conductance which is not invariant under a reversal of the applied bias. We present a new result for the differential conductance G(E) of a normal-superconducting contact which predicts that whatever the strength of contact, in the absence of open channels in the superconductor, G(E) is necessarily an even function of E and that an asymmetric current-voltage characteristic implies the existence of propagating bound-states within the vortex core. In the tunneling limit, asymmetries arise from the difference between particle and hole densities of states and if the Fermi energy is close to a singularity, is predicted to be sensitive to doping.

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Journal Article
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Czechoslovak Journal of Physics
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08 Oct 2019 12:15
Last Modified:
01 Jan 2022 14:21