Energy-dependent tunneling from few-electron dynamic quantum dots.
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.
Astley
M R
MR
Cavendish Laboratory, University of Cambridge, J.J. Thomson Avenue, Cambridge CB3 0HE, United Kingdom.
Kataoka
M
M
Ford
C J B
CJ
Barnes
C H W
CH
Anderson
D
D
Jones
G A C
GA
Farrer
I
I
Ritchie
D A
DA
Pepper
M
M