Level statistics of quantum dots coupled to reservoirs

We study the effect of electron tunneling on the level statistics of quantum dots. While the coupling between individual levels and the electron reservoir leads predominantly to the expected level broadening, the indirect coupling of adjacent levels via the reservoir results in new asymptotic level statistics and broadening. These features, which are attributed to renormalized spectral weights rather than to renormalized eigenvalues of the Hamiltonian, are observable in the asymptotic frequency dependence in an absorption experiment. [S0031-9007(98)07630-3].