The Kondo effect in Bohm-Aharonov resonant tunneling devices

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