THE KONDO EFFECT IN BOHM-AHARONOV RESONANT-TUNNELING DEVICES

The Bohm-Aharonov effect in a mesoscopic ring containing a double-barr ier structure in its upper part is investigated. The interference betw een electrons propagating along different sides of the ring is modifie d by the presence of a double barrier. A local Coulomb interaction, U, is included to describe the highly localized electrons at the well an d an Abrikosov-Suhl (AS) resonance appears at low temperatures. So, in this energy range the current is flux dependent. Above the Kondo temp erature T-K the AS resonance disappears and the flux-independent behav ior is recovered. The current is studied as a function of magnetic Aux , gate potential and position of the Fermi level.