Persistent currents through a quantum impurity: Protection through integrability
arXiv:cond-mat/0612267 · doi:10.1103/PhysRevB.76.073408
Abstract
We consider an integrable model of a one-dimensional mesoscopic ring with the conduction electrons coupled by a spin exchange to a magnetic impurity. A symmetry analysis based on a Bethe Ansatz solution of the model reveals that the current is insensitive to the presence of the impurity. We argue that this is true for any integrable impurity-electron interaction, independent of choice of physical parameters or couplings. We propose a simple physical picture of how the persistent current gets protected by integrability.
5 pages, minor updates
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