Current-flux characteristics in mesoscopic nonsuperconducting rings
Lukasz Machura, Szymon Rogozinski, Jerzy Luczka
TL;DR
This paper investigates mechanisms behind persistent currents in normal metal rings, explaining how they can be paramagnetic or diamagnetic, and aligns its findings with recent experimental observations.
Contribution
It proposes four mechanisms for persistent currents in mesoscopic rings and identifies conditions for their magnetic response sign change, matching experimental data.
Findings
Identifies four mechanisms influencing persistent current sign
Determines conditions for paramagnetic to diamagnetic transition
Qualitatively reproduces experimental results of Bluhm et al.
Abstract
We propose four different mechanisms responsible for paramagnetic or diamagnetic persistent currents in normal metal rings and determine the circumstances for change of the current from paramagnetic to diamagnetic ones and {\it vice versa}. It might qualitatively reproduce the experimental results of Bluhm et al. (Phys. Rev. Lett. 102, 136802 (2009)).
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