EFFECT OF THE COULOMB REPULSION ON THE AC TRANSPORT THROUGH A QUANTUM-DOT

We calculate using linear-response theory the admittance of a quantum dot out of equilibrium. The interaction between two electrons with opp osite spins simultaneously residing on the resonant level is modeled b y an Anderson Hamiltonian. The electron correlations lead to the appea rance of another feature in the frequency dependence of the conductanc e. For certain parameter values there are two crossover frequencies be tween capacitive and inductive behavior of the imaginary part of the a dmittance. The experimental implications of the obtained results are b riefly discussed.