title: Controlled dephasing of a quantum dot: from coherent to sequential tunneling.
abstract: Resonant tunneling through two identical potential barriers renders them transparent, as particle trajectories interfere coherently. Here we realize resonant tunneling in a quantum dot (QD), and show that detection of electron trajectories renders the dot nearly insulating. Measurements were made in the integer quantum Hall regime, with the tunneling electrons in an inner edge channel coupled to detector electrons in a neighboring outer channel, which was partitioned. Quantitative analysis indicates that just a few detector electrons completely dephase the QD.
authors.affiliation: Braun Center for Submicron Research, Department of Condensed Matter Physics, Weizmann Institute of Science, 76100 Rehovot, Israel.
authors.forename: Daniel
authors.initials: D
authors.lastname: Rohrlich
authors.forename: Oren
authors.initials: O
authors.lastname: Zarchin
authors.forename: Moty
authors.initials: M
authors.lastname: Heiblum
authors.forename: Diana
authors.initials: D
authors.lastname: Mahalu
authors.forename: Vladimir
authors.initials: V
authors.lastname: Umansky