EVEN-ODD CORRELATIONS IN CAPACITANCE FLUCTUATIONS OF QUANTUM DOTS

We investigate effects of short-range interactions on the addition spe ctra of quantum dots using a disordered Hubbard model. A correlation f unction S(q) is defined on the inverse compressibility versus filling data, and computed numerically for small lattices. Two regimes of inte raction strength are identified: the even/odd fluctuations regime typi cal of Fermi-liquid ground states, and a regime of structureless S(q) at strong interactions. We propose to understand the latter regime in terms of magnetically correlated localized spins.