title: Transmission phase lapses through a quantum dot in a strong magnetic field.
abstract: The phase of the transmission amplitude through a mesoscopic system contains information about the system's quantum mechanical state and excitations thereof. In the absence of an external magnetic field, abrupt phase lapses occur between transmission resonances of quantum dots and can be related to the signs of tunneling matrix elements. They are smeared at finite temperatures. By contrast, we show here that in the presence of a strong magnetic field, phase lapses represent a genuine interaction effect and may occur also on resonance. We identify a relevant physical regime where these phase lapses are robust against finite temperature broadening.
authors.affiliation: Department of Condensed Matter Physics, The Weizmann Institute of Science, Rehovot 76100, Israel.
authors.forename: Yehuda
authors.initials: Y
authors.lastname: Dinaii
authors.affiliation: Department of Condensed Matter Physics, The Weizmann Institute of Science, Rehovot 76100, Israel.
authors.forename: Yuval
authors.initials: Y
authors.lastname: Gefen
authors.affiliation: Institut für Theoretische Physik, Universität Leipzig, D-04103 Leipzig, Germany.
authors.forename: Bernd
authors.initials: B
authors.lastname: Rosenow