RESONANT-TUNNELING THROUGH QUANTUM-DOT ARRAYS

We apply the Hubbard Hamiltonian to describe quantum-dot arrays weakly coupled to two contacts. Exact diagonalization is used to calculate t he eigenstates of the arrays containing up to six dots and the linear- response conductance is then calculated as a function of the Fermi ene rgy. In the atomic limit the conductance peaks form two distinct group s separated by the intradot Coulomb repulsion, while in the band limit the peaks occur in pairs. The crossover is studied. A finite interdot repulsion is found to cause interesting rearrangements in the conduct ance spectrum.