title: Multipeak Kondo effect in one- and two-electron quantum dots.
abstract: We have fabricated a few-electron quantum dot that can be tuned down to zero electrons while maintaining strong coupling to the leads. Using a nearby quantum point contact as a charge sensor, we can determine the absolute number of electrons in the quantum dot. We find several sharp peaks in the differential conductance, occurring at both zero and finite source-drain bias, for the one- and two-electron quantum dot. We attribute the peaks at finite bias to a Kondo effect through excited states of the quantum dot and investigate the magnetic field dependence of these Kondo resonances.
authors.affiliation: Division of Engineering and Applied Sciences and Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA.
authors.forename: A
authors.initials: A
authors.lastname: Vidan
authors.forename: M
authors.initials: M
authors.lastname: Stopa
authors.forename: R M
authors.initials: RM
authors.lastname: Westervelt
authors.forename: M
authors.initials: M
authors.lastname: Hanson
authors.forename: A C
authors.initials: AC
authors.lastname: Gossard