Superconductor-Insulator Magneto-Oscillations in Superconducting Strips

Yeshayahu Atzmon; Efrat Shimshoni

doi:10.1103/physrevb.83.220518

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arXiv · 1010.0664

Superconductor-Insulator Magneto-Oscillations in Superconducting Strips

Yeshayahu Atzmon·Efrat Shimshoni

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Abstract

The magnetoresistance of thin superconducting strips subject to a perpendicular magnetic field B and low temperatures T manifests a sequence of alternating superconductor-insulator transitions (SIT). We study this phenomenon within a quasi one-dimensional (1D) model for the quantum dynamics of vortices in a line-junction between coupled parallel SC wires, at parameters close to their SIT. Mapping the vortex system to 1D Fermions at a chemical potential dictated by B, we find that a quantum phase transition of the Ising type occurs at critical values of the vortex filling, from a SC phase near integer filling to an insulator near 1/2-filling. For T->0, the resulting magnetoresistance R(B) exhibits oscillations similar to the experimental observation.

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Yeshayahu Atzmon, Efrat Shimshoni. 2011-07-06. Superconductor-Insulator Magneto-Oscillations in Superconducting Strips. https://doi.org/10.1103/physrevb.83.220518

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