AHARONOV-BOHM OSCILLATIONS AND RESONANT-TUNNELING IN STRONGLY CORRELATED QUANTUM DOTS

We investigate Aharonov-Bohm oscillations of the current through a str ongly correlated quantum dot embedded in an arbitrary scattering geome try. Resonant-tunneling processes lead to a flux-dependent renormaliza tion of the dot level. As a consequence, we obtain a fine structure of the current oscillations, which is controlled by quantum fluctuations . Strong Coulomb repulsion leads to a continuous bias voltage dependen t phase shift and, in the nonlinear response regime, destroys the symm etry of the differential conductance under a sign change of the extern al flux.