title: Transmission phase shift of a quantum dot with kondo correlations
abstract: We study the effects of Kondo correlations on the transmission phase shift of a quantum dot in an Aharonov-Bohm ring. We predict in detail how the development of a Kondo resonance should affect the dependence of the phase shift on transport voltage, gate voltage, and temperature. This system should allow the first direct observation of the well-known scattering phase shift of pi/2 expected (but not directly measurable in bulk systems) at zero temperature for an electron scattering off a spin- 1 / 2 impurity that is screened into a singlet.
authors.affiliation: Institut fur Theoretische Festkorperphysik, Universitat Karlsruhe, 76128 Karlsruhe, Germany.
authors.initials: U
authors.lastname: Gerland
authors.lastname: von Delft J
authors.initials: TA
authors.lastname: Costi
authors.initials: Y
authors.lastname: Oreg