title: Differential charge sensing and charge delocalization in a tunable double quantum dot.
abstract: We report measurements of a tunable double quantum dot, operating in the quantum regime, with integrated local charge sensors. The spatial resolution of the sensors allows the charge distribution within the double dot system to be resolved at fixed total charge. We use this readout scheme to investigate charge delocalization as a function of temperature and strength of tunnel coupling, demonstrating that local charge sensing can be used to accurately determine the interdot coupling in the absence of transport.
authors.affiliation: Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA.
authors.forename: L
authors.initials: L
authors.lastname: DiCarlo
authors.forename: H J
authors.initials: HJ
authors.lastname: Lynch
authors.forename: A C
authors.initials: AC
authors.lastname: Johnson
authors.forename: L I
authors.initials: LI
authors.lastname: Childress
authors.forename: K
authors.initials: K
authors.lastname: Crockett
authors.forename: C M
authors.initials: CM
authors.lastname: Marcus
authors.forename: M P
authors.initials: MP
authors.lastname: Hanson
authors.forename: A C
authors.initials: AC
authors.lastname: Gossard