title: Energy-dependent tunneling from few-electron dynamic quantum dots.
abstract: We measure the electron escape rate from surface-acoustic-wave dynamic quantum dots (QDs) through a tunnel barrier. Rate equations are used to extract the tunneling rates, which change by an order of magnitude with tunnel-barrier-gate voltage. We find that the tunneling rates depend on the number of electrons in each dynamic QD because of Coulomb energy. By comparing this dependence to a saddle-point-potential model, the addition energies of the second and third electron in each dynamic QD are estimated. The scale ( approximately a few meV) is comparable to those in static QDs as expected.
authors.affiliation: Cavendish Laboratory, University of Cambridge, J.J. Thomson Avenue, Cambridge CB3 0HE, United Kingdom.
authors.forename: M R
authors.initials: MR
authors.lastname: Astley
authors.forename: M
authors.initials: M
authors.lastname: Kataoka
authors.forename: C J B
authors.initials: CJ
authors.lastname: Ford
authors.forename: C H W
authors.initials: CH
authors.lastname: Barnes
authors.forename: D
authors.initials: D
authors.lastname: Anderson
authors.forename: G A C
authors.initials: GA
authors.lastname: Jones
authors.forename: I
authors.initials: I
authors.lastname: Farrer
authors.forename: D A
authors.initials: DA
authors.lastname: Ritchie
authors.forename: M
authors.initials: M
authors.lastname: Pepper