title: Using a quantum dot as a high-frequency shot noise detector.
abstract: We present the experimental realization of a quantum dot (QD) operating as a high-frequency noise detector. Current fluctuations produced in a nearby quantum point contact (QPC) ionize the QD and induce transport through excited states. The resulting transient current through the QD represents our detector signal. We investigate its dependence on the QPC transmission and voltage bias. We observe and explain a quantum threshold feature and a saturation in the detector signal. This experimental and theoretical study is relevant in understanding the backaction of a QPC used as a charge detector.
authors.affiliation: Kavli Institute of Nanoscience Delft, Delft University of Technology, The Netherlands. eugen.onac@philips.com
authors.forename: E
authors.initials: E
authors.lastname: Onac
authors.forename: F
authors.initials: F
authors.lastname: Balestro
authors.forename: L H Willems
authors.initials: LH
authors.lastname: van Beveren
authors.forename: U
authors.initials: U
authors.lastname: Hartmann
authors.forename: Y V
authors.initials: YV
authors.lastname: Nazarov
authors.forename: L P
authors.initials: LP
authors.lastname: Kouwenhoven