Parity Effect in a mesoscopic superconducting ring

Details Parity Effect in a mesoscopic superconducting ring Parity Effect in a mesoscopic superconducting ring

2000-05-22

arxiv.org/abs/cond-mat/0005347v1

Europhysics Letters 51, 181 (2000)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

8 pages, 2 figures, to appear in Europhys. Lett

Scientific paper

10.1209/epl/i2000-00529-8

We study a mesoscopic superconducting ring threaded by a magnetic flux when the single particle level spacing is not negligible. It is shown that, for a superconducting ring with even parity, the behavior of persistent current is equivalent to what is expected in a bulk superconducting ring. On the other hand, we find that a ring with odd parity shows anomalous behavior such as fluxoid quantization at half-integral multiples of the flux quantum and paramagnetic response at low temperature. We also discuss how the parity effect in the persistent current disappears as the temperature is raised or as the size of the ring increases.

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