title: Friedel sum rule for an interacting multiorbital quantum dot.
abstract: A generalized Friedel sum rule is derived for a quantum dot with internal orbital and spin degrees of freedom. The result is valid when all many-body correlations are taken into account and it links the phase shift of the scattered electron to the displacement of its spectral density into the dot.
authors.affiliation: CNR-INFM National Research Center S3, Via Campi 213/A, 41100 Modena, Italy. rotani@unimore.it
authors.forename: Massimo
authors.initials: M
authors.lastname: Rontani