Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2010-10-22
Phys. Rev. Lett. 107, 017002 (2011)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
4+a bit pages, 3 figures, 1 table
Scientific paper
10.1103/PhysRevLett.107.017002
Recent experiments on the conductance of thin, narrow superconducting strips have found periodic fluctuations, as a function of the perpendicular magnetic field, with a period corresponding to approximately two flux quanta per strip area [A. Johansson et al., Phys. Rev. Lett. {\bf 95}, 116805 (2005)]. We argue that the low-energy degrees of freedom responsible for dissipation correspond to vortex motion. Using vortex/charge duality, we show that the superconducting strip behaves as the dual of a quantum dot, with the vortices, magnetic field, and bias current respectively playing the roles of the electrons, gate voltage and source-drain voltage. In the bias-current vs. magnetic-field plane, the strip conductance displays what we term `Weber blockade' diamonds, with vortex conductance maxima (i.e., electrical resistance maxima) that, at small bias-currents, correspond to the fields at which strip states of $N$ and $N+1$ vortices have equal energy.
Goldbart Paul M.
Pekker David
Refael Gil
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