Large diamagnetic persistent currents
Sheelan Sengupta Chowdhury, P. Singha Deo, Ashim Kumar Roy, M., Manninen
TL;DR
This paper explains the large diamagnetic persistent currents in multichannel rings by showing that evanescent modes, which coexist with propagating modes, can carry significant diamagnetic currents and are sensitive to impurities, aligning with experimental observations.
Contribution
It introduces the role of evanescent modes in carrying large diamagnetic persistent currents, providing a natural explanation for experimental results.
Findings
Evanescent modes carry large diamagnetic currents.
Persistent currents oscillate with energy.
Impurity scattering affects evanescent mode currents.
Abstract
In multichannel rings, evanescent modes will always co-exist with propagating modes. The evanescent modes can carry a very large diamagnetic persistent current that can oscillate with energy and are very sensitive to impurity scattering. This provides a natural explanation for the large diamagnetic persistent currents observed in experiments.
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