Theoretische Physik II

Persistent current induced by magnetic impurities

P. Schwab and U. Eckern

We calculate the average persistent current in a normal conducting, mesoscopic ring in the diffusive regime. In the presence of magnetic impurities, a contribution to the persistent current is identified, which is related to fluctuations in the electron spin density. Assuming a spin-flip scattering rate which is comparable to the Thouless energy $E_c$ and low temperature, this new contribution to the persistent current s of the order $I\sim E_c^2/(kT\phi_0)$, which is considerably larger than the persistent current induced by the electron-electron interaction.

• Full Text (with figures)
  • 100kB ps.gz