Quantum Interference by Vortex Supercurrents

Abstract

We analyze the origin of the parabolic background of magnetoresistance oscillations measured in finite-width superconducting mesoscopic rings with input and output stubs and in patterned films. The transmission model explaining the sinusoidal oscillation of magnetoresistance is extended to address the parabolic background as a function of the magnetic field. Apart from the interference mechanism activated by the ring, pinned superconducting vortices as topological defects introduce a further interference-based distribution of supercurrents that affects, in turn, the voltmeter-sensed quasiparticles. The onset of vortices changes the topology of the superconducting state in a mesoscopic ring in a such a way that the full magnetoresistance dynamics can be interpreted owing to the interference of the constituents of the order parameter induced by both the ring with its doubly-connected topology and the vortex lattice in it.

15 pages, 6 figures

References in corpus (6)

• Majorana qubit decoherence by quasiparticle poisoning
• Magnetic Interference Patterns and Vortices in Diffusive SNS junctions
• Perspective: Challenges and Transformative Opportunities in Superconductor Vortex Physics
• Little-Parks effect in single YBaCuO sub-micron rings
• Experimental investigations of the problem of the quantum jump with the help of superconductor nanostructures
• Ordered Bose Glass of Vortices in Superconducting YBa${}_2$Cu${}_3$O${}_{7-\delta }$ Thin Films with a Periodic Pin Lattice Created by Focused Helium Ion Irradiation